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* Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/netLinus Torvalds2019-09-0257-402/+584
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Pull networking fixes from David Miller: 1) Fix some length checks during OGM processing in batman-adv, from Sven Eckelmann. 2) Fix regression that caused netfilter conntrack sysctls to not be per-netns any more. From Florian Westphal. 3) Use after free in netpoll, from Feng Sun. 4) Guard destruction of pfifo_fast per-cpu qdisc stats with qdisc_is_percpu_stats(), from Davide Caratti. Similar bug is fixed in pfifo_fast_enqueue(). 5) Fix memory leak in mld_del_delrec(), from Eric Dumazet. 6) Handle neigh events on internal ports correctly in nfp, from John Hurley. 7) Clear SKB timestamp in NF flow table code so that it does not confuse fq scheduler. From Florian Westphal. 8) taprio destroy can crash if it is invoked in a failure path of taprio_init(), because the list head isn't setup properly yet and the list del is unconditional. Perform the list add earlier to address this. From Vladimir Oltean. 9) Make sure to reapply vlan filters on device up, in aquantia driver. From Dmitry Bogdanov. 10) sgiseeq driver releases DMA memory using free_page() instead of dma_free_attrs(). From Christophe JAILLET. * git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (58 commits) net: seeq: Fix the function used to release some memory in an error handling path enetc: Add missing call to 'pci_free_irq_vectors()' in probe and remove functions net: bcmgenet: use ethtool_op_get_ts_info() tc-testing: don't hardcode 'ip' in nsPlugin.py net: dsa: microchip: add KSZ8563 compatibility string dt-bindings: net: dsa: document additional Microchip KSZ8563 switch net: aquantia: fix out of memory condition on rx side net: aquantia: linkstate irq should be oneshot net: aquantia: reapply vlan filters on up net: aquantia: fix limit of vlan filters net: aquantia: fix removal of vlan 0 net/sched: cbs: Set default link speed to 10 Mbps in cbs_set_port_rate taprio: Set default link speed to 10 Mbps in taprio_set_picos_per_byte taprio: Fix kernel panic in taprio_destroy net: dsa: microchip: fill regmap_config name rxrpc: Fix lack of conn cleanup when local endpoint is cleaned up [ver #2] net: stmmac: dwmac-rk: Don't fail if phy regulator is absent amd-xgbe: Fix error path in xgbe_mod_init() netfilter: nft_meta_bridge: Fix get NFT_META_BRI_IIFVPROTO in network byteorder mac80211: Correctly set noencrypt for PAE frames ...
| * net/sched: cbs: Set default link speed to 10 Mbps in cbs_set_port_rateVladimir Oltean2019-09-011-8/+11
| | | | | | | | | | | | | | | | | | | | | | | | The discussion to be made is absolutely the same as in the case of previous patch ("taprio: Set default link speed to 10 Mbps in taprio_set_picos_per_byte"). Nothing is lost when setting a default. Cc: Leandro Dorileo <leandro.maciel.dorileo@intel.com> Fixes: e0a7683d30e9 ("net/sched: cbs: fix port_rate miscalculation") Acked-by: Vinicius Costa Gomes <vinicius.gomes@intel.com> Signed-off-by: Vladimir Oltean <olteanv@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
| * taprio: Set default link speed to 10 Mbps in taprio_set_picos_per_byteVladimir Oltean2019-09-011-10/+13
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The taprio budget needs to be adapted at runtime according to interface link speed. But that handling is problematic. For one thing, installing a qdisc on an interface that doesn't have carrier is not illegal. But taprio prints the following stack trace: [ 31.851373] ------------[ cut here ]------------ [ 31.856024] WARNING: CPU: 1 PID: 207 at net/sched/sch_taprio.c:481 taprio_dequeue+0x1a8/0x2d4 [ 31.864566] taprio: dequeue() called with unknown picos per byte. [ 31.864570] Modules linked in: [ 31.873701] CPU: 1 PID: 207 Comm: tc Not tainted 5.3.0-rc5-01199-g8838fe023cd6 #1689 [ 31.881398] Hardware name: Freescale LS1021A [ 31.885661] [<c03133a4>] (unwind_backtrace) from [<c030d8cc>] (show_stack+0x10/0x14) [ 31.893368] [<c030d8cc>] (show_stack) from [<c10ac958>] (dump_stack+0xb4/0xc8) [ 31.900555] [<c10ac958>] (dump_stack) from [<c0349d04>] (__warn+0xe0/0xf8) [ 31.907395] [<c0349d04>] (__warn) from [<c0349d64>] (warn_slowpath_fmt+0x48/0x6c) [ 31.914841] [<c0349d64>] (warn_slowpath_fmt) from [<c0f38db4>] (taprio_dequeue+0x1a8/0x2d4) [ 31.923150] [<c0f38db4>] (taprio_dequeue) from [<c0f227b0>] (__qdisc_run+0x90/0x61c) [ 31.930856] [<c0f227b0>] (__qdisc_run) from [<c0ec82ac>] (net_tx_action+0x12c/0x2bc) [ 31.938560] [<c0ec82ac>] (net_tx_action) from [<c0302298>] (__do_softirq+0x130/0x3c8) [ 31.946350] [<c0302298>] (__do_softirq) from [<c03502a0>] (irq_exit+0xbc/0xd8) [ 31.953536] [<c03502a0>] (irq_exit) from [<c03a4808>] (__handle_domain_irq+0x60/0xb4) [ 31.961328] [<c03a4808>] (__handle_domain_irq) from [<c0754478>] (gic_handle_irq+0x58/0x9c) [ 31.969638] [<c0754478>] (gic_handle_irq) from [<c0301a8c>] (__irq_svc+0x6c/0x90) [ 31.977076] Exception stack(0xe8167b20 to 0xe8167b68) [ 31.982100] 7b20: e9d4bd80 00000cc0 000000cf 00000000 e9d4bd80 c1f38958 00000cc0 c1f38960 [ 31.990234] 7b40: 00000001 000000cf 00000004 e9dc0800 00000000 e8167b70 c0f478ec c0f46d94 [ 31.998363] 7b60: 60070013 ffffffff [ 32.001833] [<c0301a8c>] (__irq_svc) from [<c0f46d94>] (netlink_trim+0x18/0xd8) [ 32.009104] [<c0f46d94>] (netlink_trim) from [<c0f478ec>] (netlink_broadcast_filtered+0x34/0x414) [ 32.017930] [<c0f478ec>] (netlink_broadcast_filtered) from [<c0f47cec>] (netlink_broadcast+0x20/0x28) [ 32.027102] [<c0f47cec>] (netlink_broadcast) from [<c0eea378>] (rtnetlink_send+0x34/0x88) [ 32.035238] [<c0eea378>] (rtnetlink_send) from [<c0f25890>] (notify_and_destroy+0x2c/0x44) [ 32.043461] [<c0f25890>] (notify_and_destroy) from [<c0f25e08>] (qdisc_graft+0x398/0x470) [ 32.051595] [<c0f25e08>] (qdisc_graft) from [<c0f27a00>] (tc_modify_qdisc+0x3a4/0x724) [ 32.059470] [<c0f27a00>] (tc_modify_qdisc) from [<c0ee4c84>] (rtnetlink_rcv_msg+0x260/0x2ec) [ 32.067864] [<c0ee4c84>] (rtnetlink_rcv_msg) from [<c0f4a988>] (netlink_rcv_skb+0xb8/0x110) [ 32.076172] [<c0f4a988>] (netlink_rcv_skb) from [<c0f4a170>] (netlink_unicast+0x1b4/0x22c) [ 32.084392] [<c0f4a170>] (netlink_unicast) from [<c0f4a5e4>] (netlink_sendmsg+0x33c/0x380) [ 32.092614] [<c0f4a5e4>] (netlink_sendmsg) from [<c0ea9f40>] (sock_sendmsg+0x14/0x24) [ 32.100403] [<c0ea9f40>] (sock_sendmsg) from [<c0eaa780>] (___sys_sendmsg+0x214/0x228) [ 32.108279] [<c0eaa780>] (___sys_sendmsg) from [<c0eabad0>] (__sys_sendmsg+0x50/0x8c) [ 32.116068] [<c0eabad0>] (__sys_sendmsg) from [<c0301000>] (ret_fast_syscall+0x0/0x54) [ 32.123938] Exception stack(0xe8167fa8 to 0xe8167ff0) [ 32.128960] 7fa0: b6fa68c8 000000f8 00000003 bea142d0 00000000 00000000 [ 32.137093] 7fc0: b6fa68c8 000000f8 0052154c 00000128 5d6468a2 00000000 00000028 00558c9c [ 32.145224] 7fe0: 00000070 bea14278 00530d64 b6e17e64 [ 32.150659] ---[ end trace 2139c9827c3e5177 ]--- This happens because the qdisc ->dequeue callback gets called. Which again is not illegal, the qdisc will dequeue even when the interface is up but doesn't have carrier (and hence SPEED_UNKNOWN), and the frames will be dropped further down the stack in dev_direct_xmit(). And, at the end of the day, for what? For calculating the initial budget of an interface which is non-operational at the moment and where frames will get dropped anyway. So if we can't figure out the link speed, default to SPEED_10 and move along. We can also remove the runtime check now. Cc: Leandro Dorileo <leandro.maciel.dorileo@intel.com> Fixes: 7b9eba7ba0c1 ("net/sched: taprio: fix picos_per_byte miscalculation") Acked-by: Vinicius Costa Gomes <vinicius.gomes@intel.com> Signed-off-by: Vladimir Oltean <olteanv@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
| * taprio: Fix kernel panic in taprio_destroyVladimir Oltean2019-09-011-4/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | taprio_init may fail earlier than this line: list_add(&q->taprio_list, &taprio_list); i.e. due to the net device not being multi queue. Attempting to remove q from the global taprio_list when it is not part of it will result in a kernel panic. Fix it by matching list_add and list_del better to one another in the order of operations. This way we can keep the deletion unconditional and with lower complexity - O(1). Cc: Leandro Dorileo <leandro.maciel.dorileo@intel.com> Fixes: 7b9eba7ba0c1 ("net/sched: taprio: fix picos_per_byte miscalculation") Signed-off-by: Vladimir Oltean <olteanv@gmail.com> Acked-by: Vinicius Costa Gomes <vinicius.gomes@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
| * Merge tag 'batadv-net-for-davem-20190830' of git://git.open-mesh.org/linux-mergeDavid S. Miller2019-08-312-13/+25
| |\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Simon Wunderlich says: ==================== Here are two batman-adv bugfixes: - Fix OGM and OGMv2 header read boundary check, by Sven Eckelmann (2 patches) ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
| | * batman-adv: Only read OGM2 tvlv_len after buffer len checkSven Eckelmann2019-08-231-6/+12
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Multiple batadv_ogm2_packet can be stored in an skbuff. The functions batadv_v_ogm_send_to_if() uses batadv_v_ogm_aggr_packet() to check if there is another additional batadv_ogm2_packet in the skb or not before they continue processing the packet. The length for such an OGM2 is BATADV_OGM2_HLEN + batadv_ogm2_packet->tvlv_len. The check must first check that at least BATADV_OGM2_HLEN bytes are available before it accesses tvlv_len (which is part of the header. Otherwise it might try read outside of the currently available skbuff to get the content of tvlv_len. Fixes: 9323158ef9f4 ("batman-adv: OGMv2 - implement originators logic") Signed-off-by: Sven Eckelmann <sven@narfation.org> Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
| | * batman-adv: Only read OGM tvlv_len after buffer len checkSven Eckelmann2019-08-231-7/+13
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Multiple batadv_ogm_packet can be stored in an skbuff. The functions batadv_iv_ogm_send_to_if()/batadv_iv_ogm_receive() use batadv_iv_ogm_aggr_packet() to check if there is another additional batadv_ogm_packet in the skb or not before they continue processing the packet. The length for such an OGM is BATADV_OGM_HLEN + batadv_ogm_packet->tvlv_len. The check must first check that at least BATADV_OGM_HLEN bytes are available before it accesses tvlv_len (which is part of the header. Otherwise it might try read outside of the currently available skbuff to get the content of tvlv_len. Fixes: ef26157747d4 ("batman-adv: tvlv - basic infrastructure") Reported-by: syzbot+355cab184197dbbfa384@syzkaller.appspotmail.com Signed-off-by: Sven Eckelmann <sven@narfation.org> Acked-by: Antonio Quartulli <a@unstable.cc> Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
| * | Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nfDavid S. Miller2019-08-315-7/+11
| |\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Pablo Neira Ayuso says: ==================== Netfilter fixes for net The following patchset contains Netfilter fixes for net: 1) Spurious warning when loading rules using the physdev match, from Todd Seidelmann. 2) Fix FTP conntrack helper debugging output, from Thomas Jarosch. 3) Restore per-netns nf_conntrack_{acct,helper,timeout} sysctl knobs, from Florian Westphal. 4) Clear skbuff timestamp from the flowtable datapath, also from Florian. 5) Fix incorrect byteorder of NFT_META_BRI_IIFVPROTO, from wenxu. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
| | * | netfilter: nft_meta_bridge: Fix get NFT_META_BRI_IIFVPROTO in network byteorderwenxu2019-08-301-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Get the vlan_proto of ingress bridge in network byteorder as userspace expects. Otherwise this is inconsistent with NFT_META_PROTOCOL. Fixes: 2a3a93ef0ba5 ("netfilter: nft_meta_bridge: Add NFT_META_BRI_IIFVPROTO support") Signed-off-by: wenxu <wenxu@ucloud.cn> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
| | * | netfilter: nf_flow_table: clear skb tstamp before xmitFlorian Westphal2019-08-291-1/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | If 'fq' qdisc is used and a program has requested timestamps, skb->tstamp needs to be cleared, else fq will treat these as 'transmit time'. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
| | * | netfilter: conntrack: make sysctls per-namespace againFlorian Westphal2019-08-271-0/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When I merged the extension sysctl tables with the main one I forgot to reset them on netns creation. They currently read/write init_net settings. Fixes: d912dec12428 ("netfilter: conntrack: merge acct and helper sysctl table with main one") Fixes: cb2833ed0044 ("netfilter: conntrack: merge ecache and timestamp sysctl tables with main one") Reported-by: Shmulik Ladkani <shmulik.ladkani@gmail.com> Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
| | * | netfilter: nf_conntrack_ftp: Fix debug outputThomas Jarosch2019-08-271-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The find_pattern() debug output was printing the 'skip' character. This can be a NULL-byte and messes up further pr_debug() output. Output without the fix: kernel: nf_conntrack_ftp: Pattern matches! kernel: nf_conntrack_ftp: Skipped up to `<7>nf_conntrack_ftp: find_pattern `PORT': dlen = 8 kernel: nf_conntrack_ftp: find_pattern `EPRT': dlen = 8 Output with the fix: kernel: nf_conntrack_ftp: Pattern matches! kernel: nf_conntrack_ftp: Skipped up to 0x0 delimiter! kernel: nf_conntrack_ftp: Match succeeded! kernel: nf_conntrack_ftp: conntrack_ftp: match `172,17,0,100,200,207' (20 bytes at 4150681645) kernel: nf_conntrack_ftp: find_pattern `PORT': dlen = 8 Signed-off-by: Thomas Jarosch <thomas.jarosch@intra2net.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
| | * | netfilter: xt_physdev: Fix spurious error message in physdev_mt_checkTodd Seidelmann2019-08-271-4/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Simplify the check in physdev_mt_check() to emit an error message only when passed an invalid chain (ie, NF_INET_LOCAL_OUT). This avoids cluttering up the log with errors against valid rules. For large/heavily modified rulesets, current behavior can quickly overwhelm the ring buffer, because this function gets called on every change, regardless of the rule that was changed. Signed-off-by: Todd Seidelmann <tseidelmann@linode.com> Acked-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
| * | | rxrpc: Fix lack of conn cleanup when local endpoint is cleaned up [ver #2]David Howells2019-08-315-5/+50
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When a local endpoint is ceases to be in use, such as when the kafs module is unloaded, the kernel will emit an assertion failure if there are any outstanding client connections: rxrpc: Assertion failed ------------[ cut here ]------------ kernel BUG at net/rxrpc/local_object.c:433! and even beyond that, will evince other oopses if there are service connections still present. Fix this by: (1) Removing the triggering of connection reaping when an rxrpc socket is released. These don't actually clean up the connections anyway - and further, the local endpoint may still be in use through another socket. (2) Mark the local endpoint as dead when we start the process of tearing it down. (3) When destroying a local endpoint, strip all of its client connections from the idle list and discard the ref on each that the list was holding. (4) When destroying a local endpoint, call the service connection reaper directly (rather than through a workqueue) to immediately kill off all outstanding service connections. (5) Make the service connection reaper reap connections for which the local endpoint is marked dead. Only after destroying the connections can we close the socket lest we get an oops in a workqueue that's looking at a connection or a peer. Fixes: 3d18cbb7fd0c ("rxrpc: Fix conn expiry timers") Signed-off-by: David Howells <dhowells@redhat.com> Tested-by: Marc Dionne <marc.dionne@auristor.com> Signed-off-by: David S. Miller <davem@davemloft.net>
| * | | Merge tag 'rxrpc-fixes-20190827' of ↵David S. Miller2019-08-3013-237/+291
| |\ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs David Howells says: ==================== rxrpc: Fix use of skb_cow_data() Here's a series of patches that replaces the use of skb_cow_data() in rxrpc with skb_unshare() early on in the input process. The problem that is being seen is that skb_cow_data() indirectly requires that the maximum usage count on an sk_buff be 1, and it may generate an assertion failure in pskb_expand_head() if not. This can occur because rxrpc_input_data() may be still holding a ref when it has just attached the sk_buff to the rx ring and given that attachment its own ref. If recvmsg happens fast enough, skb_cow_data() can see the ref still held by the softirq handler. Further, a packet may contain multiple subpackets, each of which gets its own attachment to the ring and its own ref - also making skb_cow_data() go bang. Fix this by: (1) The DATA packet is currently parsed for subpackets twice by the input routines. Parse it just once instead and make notes in the sk_buff private data. (2) Use the notes from (1) when attaching the packet to the ring multiple times. Once the packet is attached to the ring, recvmsg can see it and start modifying it, so the softirq handler is not permitted to look inside it from that point. (3) Pass the ref from the input code to the ring rather than getting an extra ref. rxrpc_input_data() uses a ref on the second refcount to prevent the packet from evaporating under it. (4) Call skb_unshare() on secured DATA packets in rxrpc_input_packet() before we take call->input_lock. Other sorts of packets don't get modified and so can be left. A trace is emitted if skb_unshare() eats the skb. Note that skb_share() for our accounting in this regard as we can't see the parameters in the packet to log in a trace line if it releases it. (5) Remove the calls to skb_cow_data(). These are then no longer necessary. There are also patches to improve the rxrpc_skb tracepoint to make sure that Tx-derived buffers are identified separately from Rx-derived buffers in the trace. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
| | * | | rxrpc: Use skb_unshare() rather than skb_cow_data()David Howells2019-08-274-28/+48
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The in-place decryption routines in AF_RXRPC's rxkad security module currently call skb_cow_data() to make sure the data isn't shared and that the skb can be written over. This has a problem, however, as the softirq handler may be still holding a ref or the Rx ring may be holding multiple refs when skb_cow_data() is called in rxkad_verify_packet() - and so skb_shared() returns true and __pskb_pull_tail() dislikes that. If this occurs, something like the following report will be generated. kernel BUG at net/core/skbuff.c:1463! ... RIP: 0010:pskb_expand_head+0x253/0x2b0 ... Call Trace: __pskb_pull_tail+0x49/0x460 skb_cow_data+0x6f/0x300 rxkad_verify_packet+0x18b/0xb10 [rxrpc] rxrpc_recvmsg_data.isra.11+0x4a8/0xa10 [rxrpc] rxrpc_kernel_recv_data+0x126/0x240 [rxrpc] afs_extract_data+0x51/0x2d0 [kafs] afs_deliver_fs_fetch_data+0x188/0x400 [kafs] afs_deliver_to_call+0xac/0x430 [kafs] afs_wait_for_call_to_complete+0x22f/0x3d0 [kafs] afs_make_call+0x282/0x3f0 [kafs] afs_fs_fetch_data+0x164/0x300 [kafs] afs_fetch_data+0x54/0x130 [kafs] afs_readpages+0x20d/0x340 [kafs] read_pages+0x66/0x180 __do_page_cache_readahead+0x188/0x1a0 ondemand_readahead+0x17d/0x2e0 generic_file_read_iter+0x740/0xc10 __vfs_read+0x145/0x1a0 vfs_read+0x8c/0x140 ksys_read+0x4a/0xb0 do_syscall_64+0x43/0xf0 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Fix this by using skb_unshare() instead in the input path for DATA packets that have a security index != 0. Non-DATA packets don't need in-place encryption and neither do unencrypted DATA packets. Fixes: 248f219cb8bc ("rxrpc: Rewrite the data and ack handling code") Reported-by: Julian Wollrath <jwollrath@web.de> Signed-off-by: David Howells <dhowells@redhat.com>
| | * | | rxrpc: Use the tx-phase skb flag to simplify tracingDavid Howells2019-08-2711-47/+47
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Use the previously-added transmit-phase skbuff private flag to simplify the socket buffer tracing a bit. Which phase the skbuff comes from can now be divined from the skb rather than having to be guessed from the call state. We can also reduce the number of rxrpc_skb_trace values by eliminating the difference between Tx and Rx in the symbols. Signed-off-by: David Howells <dhowells@redhat.com>
| | * | | rxrpc: Add a private skb flag to indicate transmission-phase skbsDavid Howells2019-08-272-1/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add a flag in the private data on an skbuff to indicate that this is a transmission-phase buffer rather than a receive-phase buffer. Signed-off-by: David Howells <dhowells@redhat.com>
| | * | | rxrpc: Abstract out rxtx ring cleanupDavid Howells2019-08-271-16/+17
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Abstract out rxtx ring cleanup into its own function from its two callers. This makes it easier to apply the same changes to both. Signed-off-by: David Howells <dhowells@redhat.com>
| | * | | rxrpc: Pass the input handler's data skb reference to the Rx ringDavid Howells2019-08-271-5/+15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Pass the reference held on a DATA skb in the rxrpc input handler into the Rx ring rather than getting an additional ref for this and then dropping the original ref at the end. Signed-off-by: David Howells <dhowells@redhat.com>
| | * | | rxrpc: Use info in skbuff instead of reparsing a jumbo packetDavid Howells2019-08-273-136/+139
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Use the information now cached in the skbuff private data to avoid the need to reparse a jumbo packet. We can find all the subpackets by dead reckoning, so it's only necessary to note how many there are, whether the last one is flagged as LAST_PACKET and whether any have the REQUEST_ACK flag set. This is necessary as once recvmsg() can see the packet, it can start modifying it, such as doing in-place decryption. Fixes: 248f219cb8bc ("rxrpc: Rewrite the data and ack handling code") Signed-off-by: David Howells <dhowells@redhat.com>
| | * | | rxrpc: Improve jumbo packet countingDavid Howells2019-08-273-12/+30
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Improve the information stored about jumbo packets so that we don't need to reparse them so much later. Signed-off-by: David Howells <dhowells@redhat.com> Reviewed-by: Jeffrey Altman <jaltman@auristor.com>
| * | | | mac80211: Correctly set noencrypt for PAE framesDenis Kenzior2019-08-291-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The noencrypt flag was intended to be set if the "frame was received unencrypted" according to include/uapi/linux/nl80211.h. However, the current behavior is opposite of this. Cc: stable@vger.kernel.org Fixes: 018f6fbf540d ("mac80211: Send control port frames over nl80211") Signed-off-by: Denis Kenzior <denkenz@gmail.com> Link: https://lore.kernel.org/r/20190827224120.14545-3-denkenz@gmail.com Signed-off-by: Johannes Berg <johannes.berg@intel.com>
| * | | | mac80211: Don't memset RXCB prior to PAE interceptDenis Kenzior2019-08-291-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In ieee80211_deliver_skb_to_local_stack intercepts EAPoL frames if mac80211 is configured to do so and forwards the contents over nl80211. During this process some additional data is also forwarded, including whether the frame was received encrypted or not. Unfortunately just prior to the call to ieee80211_deliver_skb_to_local_stack, skb->cb is cleared, resulting in incorrect data being exposed over nl80211. Fixes: 018f6fbf540d ("mac80211: Send control port frames over nl80211") Cc: stable@vger.kernel.org Signed-off-by: Denis Kenzior <denkenz@gmail.com> Link: https://lore.kernel.org/r/20190827224120.14545-2-denkenz@gmail.com Signed-off-by: Johannes Berg <johannes.berg@intel.com>
| * | | | net/sched: pfifo_fast: fix wrong dereference in pfifo_fast_enqueueDavide Caratti2019-08-291-2/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Now that 'TCQ_F_CPUSTATS' bit can be cleared, depending on the value of 'TCQ_F_NOLOCK' bit in the parent qdisc, we can't assume anymore that per-cpu counters are there in the error path of skb_array_produce(). Otherwise, the following splat can be seen: Unable to handle kernel paging request at virtual address 0000600dea430008 Mem abort info: ESR = 0x96000005 Exception class = DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 Data abort info: ISV = 0, ISS = 0x00000005 CM = 0, WnR = 0 user pgtable: 64k pages, 48-bit VAs, pgdp = 000000007b97530e [0000600dea430008] pgd=0000000000000000, pud=0000000000000000 Internal error: Oops: 96000005 [#1] SMP [...] pstate: 10000005 (nzcV daif -PAN -UAO) pc : pfifo_fast_enqueue+0x524/0x6e8 lr : pfifo_fast_enqueue+0x46c/0x6e8 sp : ffff800d39376fe0 x29: ffff800d39376fe0 x28: 1ffff001a07d1e40 x27: ffff800d03e8f188 x26: ffff800d03e8f200 x25: 0000000000000062 x24: ffff800d393772f0 x23: 0000000000000000 x22: 0000000000000403 x21: ffff800cca569a00 x20: ffff800d03e8ee00 x19: ffff800cca569a10 x18: 00000000000000bf x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000 x14: ffff1001a726edd0 x13: 1fffe4000276a9a4 x12: 0000000000000000 x11: dfff200000000000 x10: ffff800d03e8f1a0 x9 : 0000000000000003 x8 : 0000000000000000 x7 : 00000000f1f1f1f1 x6 : ffff1001a726edea x5 : ffff800cca56a53c x4 : 1ffff001bf9a8003 x3 : 1ffff001bf9a8003 x2 : 1ffff001a07d1dcb x1 : 0000600dea430000 x0 : 0000600dea430008 Process ping (pid: 6067, stack limit = 0x00000000dc0aa557) Call trace: pfifo_fast_enqueue+0x524/0x6e8 htb_enqueue+0x660/0x10e0 [sch_htb] __dev_queue_xmit+0x123c/0x2de0 dev_queue_xmit+0x24/0x30 ip_finish_output2+0xc48/0x1720 ip_finish_output+0x548/0x9d8 ip_output+0x334/0x788 ip_local_out+0x90/0x138 ip_send_skb+0x44/0x1d0 ip_push_pending_frames+0x5c/0x78 raw_sendmsg+0xed8/0x28d0 inet_sendmsg+0xc4/0x5c0 sock_sendmsg+0xac/0x108 __sys_sendto+0x1ac/0x2a0 __arm64_sys_sendto+0xc4/0x138 el0_svc_handler+0x13c/0x298 el0_svc+0x8/0xc Code: f9402e80 d538d081 91002000 8b010000 (885f7c03) Fix this by testing the value of 'TCQ_F_CPUSTATS' bit in 'qdisc->flags', before dereferencing 'qdisc->cpu_qstats'. Fixes: 8a53e616de29 ("net: sched: when clearing NOLOCK, clear TCQ_F_CPUSTATS, too") CC: Paolo Abeni <pabeni@redhat.com> CC: Stefano Brivio <sbrivio@redhat.com> Reported-by: Li Shuang <shuali@redhat.com> Signed-off-by: Davide Caratti <dcaratti@redhat.com> Acked-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
| * | | | tcp: inherit timestamp on mtu probeWillem de Bruijn2019-08-291-1/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | TCP associates tx timestamp requests with a byte in the bytestream. If merging skbs in tcp_mtu_probe, migrate the tstamp request. Similar to MSG_EOR, do not allow moving a timestamp from any segment in the probe but the last. This to avoid merging multiple timestamps. Tested with the packetdrill script at https://github.com/wdebruij/packetdrill/commits/mtu_probe-1 Link: http://patchwork.ozlabs.org/patch/1143278/#2232897 Fixes: 4ed2d765dfac ("net-timestamp: TCP timestamping") Signed-off-by: Willem de Bruijn <willemb@google.com> Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
| * | | | net: sched: act_sample: fix psample group handling on overwriteVlad Buslov2019-08-292-2/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Action sample doesn't properly handle psample_group pointer in overwrite case. Following issues need to be fixed: - In tcf_sample_init() function RCU_INIT_POINTER() is used to set s->psample_group, even though we neither setting the pointer to NULL, nor preventing concurrent readers from accessing the pointer in some way. Use rcu_swap_protected() instead to safely reset the pointer. - Old value of s->psample_group is not released or deallocated in any way, which results resource leak. Use psample_group_put() on non-NULL value obtained with rcu_swap_protected(). - The function psample_group_put() that released reference to struct psample_group pointed by rcu-pointer s->psample_group doesn't respect rcu grace period when deallocating it. Extend struct psample_group with rcu head and use kfree_rcu when freeing it. Fixes: 5c5670fae430 ("net/sched: Introduce sample tc action") Signed-off-by: Vlad Buslov <vladbu@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
| * | | | openvswitch: Clear the L4 portion of the key for "later" fragments.Justin Pettit2019-08-281-1/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Only the first fragment in a datagram contains the L4 headers. When the Open vSwitch module parses a packet, it always sets the IP protocol field in the key, but can only set the L4 fields on the first fragment. The original behavior would not clear the L4 portion of the key, so garbage values would be sent in the key for "later" fragments. This patch clears the L4 fields in that circumstance to prevent sending those garbage values as part of the upcall. Signed-off-by: Justin Pettit <jpettit@ovn.org> Acked-by: Pravin B Shelar <pshelar@ovn.org> Signed-off-by: David S. Miller <davem@davemloft.net>
| * | | | openvswitch: Properly set L4 keys on "later" IP fragmentsGreg Rose2019-08-283-66/+95
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When IP fragments are reassembled before being sent to conntrack, the key from the last fragment is used. Unless there are reordering issues, the last fragment received will not contain the L4 ports, so the key for the reassembled datagram won't contain them. This patch updates the key once we have a reassembled datagram. The handle_fragments() function works on L3 headers so we pull the L3/L4 flow key update code from key_extract into a new function 'key_extract_l3l4'. Then we add a another new function ovs_flow_key_update_l3l4() and export it so that it is accessible by handle_fragments() for conntrack packet reassembly. Co-authored-by: Justin Pettit <jpettit@ovn.org> Signed-off-by: Greg Rose <gvrose8192@gmail.com> Acked-by: Pravin B Shelar <pshelar@ovn.org> Signed-off-by: David S. Miller <davem@davemloft.net>
| * | | | mld: fix memory leak in mld_del_delrec()Eric Dumazet2019-08-281-2/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Similar to the fix done for IPv4 in commit e5b1c6c6277d ("igmp: fix memory leak in igmpv3_del_delrec()"), we need to make sure mca_tomb and mca_sources are not blindly overwritten. Using swap() then a call to ip6_mc_clear_src() will take care of the missing free. BUG: memory leak unreferenced object 0xffff888117d9db00 (size 64): comm "syz-executor247", pid 6918, jiffies 4294943989 (age 25.350s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 fe 88 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<000000005b463030>] kmemleak_alloc_recursive include/linux/kmemleak.h:43 [inline] [<000000005b463030>] slab_post_alloc_hook mm/slab.h:522 [inline] [<000000005b463030>] slab_alloc mm/slab.c:3319 [inline] [<000000005b463030>] kmem_cache_alloc_trace+0x145/0x2c0 mm/slab.c:3548 [<00000000939cbf94>] kmalloc include/linux/slab.h:552 [inline] [<00000000939cbf94>] kzalloc include/linux/slab.h:748 [inline] [<00000000939cbf94>] ip6_mc_add1_src net/ipv6/mcast.c:2236 [inline] [<00000000939cbf94>] ip6_mc_add_src+0x31f/0x420 net/ipv6/mcast.c:2356 [<00000000d8972221>] ip6_mc_source+0x4a8/0x600 net/ipv6/mcast.c:449 [<000000002b203d0d>] do_ipv6_setsockopt.isra.0+0x1b92/0x1dd0 net/ipv6/ipv6_sockglue.c:748 [<000000001f1e2d54>] ipv6_setsockopt+0x89/0xd0 net/ipv6/ipv6_sockglue.c:944 [<00000000c8f7bdf9>] udpv6_setsockopt+0x4e/0x90 net/ipv6/udp.c:1558 [<000000005a9a0c5e>] sock_common_setsockopt+0x38/0x50 net/core/sock.c:3139 [<00000000910b37b2>] __sys_setsockopt+0x10f/0x220 net/socket.c:2084 [<00000000e9108023>] __do_sys_setsockopt net/socket.c:2100 [inline] [<00000000e9108023>] __se_sys_setsockopt net/socket.c:2097 [inline] [<00000000e9108023>] __x64_sys_setsockopt+0x26/0x30 net/socket.c:2097 [<00000000f4818160>] do_syscall_64+0x76/0x1a0 arch/x86/entry/common.c:296 [<000000008d367e8f>] entry_SYSCALL_64_after_hwframe+0x44/0xa9 Fixes: 1666d49e1d41 ("mld: do not remove mld souce list info when set link down") Fixes: 9c8bb163ae78 ("igmp, mld: Fix memory leak in igmpv3/mld_del_delrec()") Signed-off-by: Eric Dumazet <edumazet@google.com> Reported-by: syzbot <syzkaller@googlegroups.com> Signed-off-by: David S. Miller <davem@davemloft.net>
| * | | | net/sched: pfifo_fast: fix wrong dereference when qdisc is resetDavide Caratti2019-08-281-4/+7
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Now that 'TCQ_F_CPUSTATS' bit can be cleared, depending on the value of 'TCQ_F_NOLOCK' bit in the parent qdisc, we need to be sure that per-cpu counters are present when 'reset()' is called for pfifo_fast qdiscs. Otherwise, the following script: # tc q a dev lo handle 1: root htb default 100 # tc c a dev lo parent 1: classid 1:100 htb \ > rate 95Mbit ceil 100Mbit burst 64k [...] # tc f a dev lo parent 1: protocol arp basic classid 1:100 [...] # tc q a dev lo parent 1:100 handle 100: pfifo_fast [...] # tc q d dev lo root can generate the following splat: Unable to handle kernel paging request at virtual address dfff2c01bd148000 Mem abort info: ESR = 0x96000004 Exception class = DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 Data abort info: ISV = 0, ISS = 0x00000004 CM = 0, WnR = 0 [dfff2c01bd148000] address between user and kernel address ranges Internal error: Oops: 96000004 [#1] SMP [...] pstate: 80000005 (Nzcv daif -PAN -UAO) pc : pfifo_fast_reset+0x280/0x4d8 lr : pfifo_fast_reset+0x21c/0x4d8 sp : ffff800d09676fa0 x29: ffff800d09676fa0 x28: ffff200012ee22e4 x27: dfff200000000000 x26: 0000000000000000 x25: ffff800ca0799958 x24: ffff1001940f332b x23: 0000000000000007 x22: ffff200012ee1ab8 x21: 0000600de8a40000 x20: 0000000000000000 x19: ffff800ca0799900 x18: 0000000000000000 x17: 0000000000000002 x16: 0000000000000000 x15: 0000000000000000 x14: 0000000000000000 x13: 0000000000000000 x12: ffff1001b922e6e2 x11: 1ffff001b922e6e1 x10: 0000000000000000 x9 : 1ffff001b922e6e1 x8 : dfff200000000000 x7 : 0000000000000000 x6 : 0000000000000000 x5 : 1fffe400025dc45c x4 : 1fffe400025dc357 x3 : 00000c01bd148000 x2 : 0000600de8a40000 x1 : 0000000000000007 x0 : 0000600de8a40004 Call trace: pfifo_fast_reset+0x280/0x4d8 qdisc_reset+0x6c/0x370 htb_reset+0x150/0x3b8 [sch_htb] qdisc_reset+0x6c/0x370 dev_deactivate_queue.constprop.5+0xe0/0x1a8 dev_deactivate_many+0xd8/0x908 dev_deactivate+0xe4/0x190 qdisc_graft+0x88c/0xbd0 tc_get_qdisc+0x418/0x8a8 rtnetlink_rcv_msg+0x3a8/0xa78 netlink_rcv_skb+0x18c/0x328 rtnetlink_rcv+0x28/0x38 netlink_unicast+0x3c4/0x538 netlink_sendmsg+0x538/0x9a0 sock_sendmsg+0xac/0xf8 ___sys_sendmsg+0x53c/0x658 __sys_sendmsg+0xc8/0x140 __arm64_sys_sendmsg+0x74/0xa8 el0_svc_handler+0x164/0x468 el0_svc+0x10/0x14 Code: 910012a0 92400801 d343fc03 11000c21 (38fb6863) Fix this by testing the value of 'TCQ_F_CPUSTATS' bit in 'qdisc->flags', before dereferencing 'qdisc->cpu_qstats'. Changes since v1: - coding style improvements, thanks to Stefano Brivio Fixes: 8a53e616de29 ("net: sched: when clearing NOLOCK, clear TCQ_F_CPUSTATS, too") CC: Paolo Abeni <pabeni@redhat.com> Reported-by: Li Shuang <shuali@redhat.com> Signed-off-by: Davide Caratti <dcaratti@redhat.com> Acked-by: Paolo Abeni <pabeni@redhat.com> Reviewed-by: Stefano Brivio <sbrivio@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
| * | | | tcp: remove empty skb from write queue in error casesEric Dumazet2019-08-281-10/+20
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Vladimir Rutsky reported stuck TCP sessions after memory pressure events. Edge Trigger epoll() user would never receive an EPOLLOUT notification allowing them to retry a sendmsg(). Jason tested the case of sk_stream_alloc_skb() returning NULL, but there are other paths that could lead both sendmsg() and sendpage() to return -1 (EAGAIN), with an empty skb queued on the write queue. This patch makes sure we remove this empty skb so that Jason code can detect that the queue is empty, and call sk->sk_write_space(sk) accordingly. Fixes: ce5ec440994b ("tcp: ensure epoll edge trigger wakeup when write queue is empty") Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Jason Baron <jbaron@akamai.com> Reported-by: Vladimir Rutsky <rutsky@google.com> Cc: Soheil Hassas Yeganeh <soheil@google.com> Cc: Neal Cardwell <ncardwell@google.com> Acked-by: Soheil Hassas Yeganeh <soheil@google.com> Acked-by: Neal Cardwell <ncardwell@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
| * | | | net/rds: Fix info leak in rds6_inc_info_copy()Ka-Cheong Poon2019-08-281-1/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The rds6_inc_info_copy() function has a couple struct members which are leaking stack information. The ->tos field should hold actual information and the ->flags field needs to be zeroed out. Fixes: 3eb450367d08 ("rds: add type of service(tos) infrastructure") Fixes: b7ff8b1036f0 ("rds: Extend RDS API for IPv6 support") Reported-by: 黄ID蝴蝶 <butterflyhuangxx@gmail.com> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Ka-Cheong Poon <ka-cheong.poon@oracle.com> Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
| * | | | net: fix skb use after free in netpollFeng Sun2019-08-281-3/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | After commit baeababb5b85d5c4e6c917efe2a1504179438d3b ("tun: return NET_XMIT_DROP for dropped packets"), when tun_net_xmit drop packets, it will free skb and return NET_XMIT_DROP, netpoll_send_skb_on_dev will run into following use after free cases: 1. retry netpoll_start_xmit with freed skb; 2. queue freed skb in npinfo->txq. queue_process will also run into use after free case. hit netpoll_send_skb_on_dev first case with following kernel log: [ 117.864773] kernel BUG at mm/slub.c:306! [ 117.864773] invalid opcode: 0000 [#1] SMP PTI [ 117.864774] CPU: 3 PID: 2627 Comm: loop_printmsg Kdump: loaded Tainted: P OE 5.3.0-050300rc5-generic #201908182231 [ 117.864775] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Ubuntu-1.8.2-1ubuntu1 04/01/2014 [ 117.864775] RIP: 0010:kmem_cache_free+0x28d/0x2b0 [ 117.864781] Call Trace: [ 117.864781] ? tun_net_xmit+0x21c/0x460 [ 117.864781] kfree_skbmem+0x4e/0x60 [ 117.864782] kfree_skb+0x3a/0xa0 [ 117.864782] tun_net_xmit+0x21c/0x460 [ 117.864782] netpoll_start_xmit+0x11d/0x1b0 [ 117.864788] netpoll_send_skb_on_dev+0x1b8/0x200 [ 117.864789] __br_forward+0x1b9/0x1e0 [bridge] [ 117.864789] ? skb_clone+0x53/0xd0 [ 117.864790] ? __skb_clone+0x2e/0x120 [ 117.864790] deliver_clone+0x37/0x50 [bridge] [ 117.864790] maybe_deliver+0x89/0xc0 [bridge] [ 117.864791] br_flood+0x6c/0x130 [bridge] [ 117.864791] br_dev_xmit+0x315/0x3c0 [bridge] [ 117.864792] netpoll_start_xmit+0x11d/0x1b0 [ 117.864792] netpoll_send_skb_on_dev+0x1b8/0x200 [ 117.864792] netpoll_send_udp+0x2c6/0x3e8 [ 117.864793] write_msg+0xd9/0xf0 [netconsole] [ 117.864793] console_unlock+0x386/0x4e0 [ 117.864793] vprintk_emit+0x17e/0x280 [ 117.864794] vprintk_default+0x29/0x50 [ 117.864794] vprintk_func+0x4c/0xbc [ 117.864794] printk+0x58/0x6f [ 117.864795] loop_fun+0x24/0x41 [printmsg_loop] [ 117.864795] kthread+0x104/0x140 [ 117.864795] ? 0xffffffffc05b1000 [ 117.864796] ? kthread_park+0x80/0x80 [ 117.864796] ret_from_fork+0x35/0x40 Signed-off-by: Feng Sun <loyou85@gmail.com> Signed-off-by: Xiaojun Zhao <xiaojunzhao141@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
| * | | | net: dsa: tag_8021q: Future-proof the reserved fields in the custom VIDVladimir Oltean2019-08-281-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | After witnessing the discussion in https://lkml.org/lkml/2019/8/14/151 w.r.t. ioctl extensibility, it became clear that such an issue might prevent that the 3 RSV bits inside the DSA 802.1Q tag might also suffer the same fate and be useless for further extension. So clearly specify that the reserved bits should currently be transmitted as zero and ignored on receive. The DSA tagger already does this (and has always did), and is the only known user so far (no Wireshark dissection plugin, etc). So there should be no incompatibility to speak of. Fixes: 0471dd429cea ("net: dsa: tag_8021q: Create a stable binary format") Signed-off-by: Vladimir Oltean <olteanv@gmail.com> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
| * | | | net_sched: fix a NULL pointer deref in ipt actionCong Wang2019-08-2819-23/+24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The net pointer in struct xt_tgdtor_param is not explicitly initialized therefore is still NULL when dereferencing it. So we have to find a way to pass the correct net pointer to ipt_destroy_target(). The best way I find is just saving the net pointer inside the per netns struct tcf_idrinfo, which could make this patch smaller. Fixes: 0c66dc1ea3f0 ("netfilter: conntrack: register hooks in netns when needed by ruleset") Reported-and-tested-by: itugrok@yahoo.com Cc: Jamal Hadi Salim <jhs@mojatatu.com> Cc: Jiri Pirko <jiri@resnulli.us> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | | | | Merge tag 'ceph-for-5.3-rc7' of git://github.com/ceph/ceph-clientLinus Torvalds2019-08-301-2/+4
|\ \ \ \ \ | |/ / / / |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Pull two ceph fixes from Ilya Dryomov: "A fix for a -rc1 regression in rbd and a trivial static checker fix" * tag 'ceph-for-5.3-rc7' of git://github.com/ceph/ceph-client: rbd: restore zeroing past the overlap when reading from parent libceph: don't call crypto_free_sync_skcipher() on a NULL tfm
| * | | | libceph: don't call crypto_free_sync_skcipher() on a NULL tfmJia-Ju Bai2019-08-281-2/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In set_secret(), key->tfm is assigned to NULL on line 55, and then ceph_crypto_key_destroy(key) is executed. ceph_crypto_key_destroy(key) crypto_free_sync_skcipher(key->tfm) crypto_free_skcipher(&tfm->base); This happens to work because crypto_sync_skcipher is a trivial wrapper around crypto_skcipher: &tfm->base is still 0 and crypto_free_skcipher() handles that. Let's not rely on the layout of crypto_sync_skcipher. This bug is found by a static analysis tool STCheck written by us. Fixes: 69d6302b65a8 ("libceph: Remove VLA usage of skcipher"). Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com> Reviewed-by: Ilya Dryomov <idryomov@gmail.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
* | | | | Merge tag 'nfs-for-5.3-3' of git://git.linux-nfs.org/projects/trondmy/linux-nfsLinus Torvalds2019-08-272-22/+32
|\ \ \ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Pull NFS client bugfixes from Trond Myklebust: "Highlights include: Stable fixes: - Fix a page lock leak in nfs_pageio_resend() - Ensure O_DIRECT reports an error if the bytes read/written is 0 - Don't handle errors if the bind/connect succeeded - Revert "NFSv4/flexfiles: Abort I/O early if the layout segment was invalidat ed" Bugfixes: - Don't refresh attributes with mounted-on-file information - Fix return values for nfs4_file_open() and nfs_finish_open() - Fix pnfs layoutstats reporting of I/O errors - Don't use soft RPC calls for pNFS/flexfiles I/O, and don't abort for soft I/O errors when the user specifies a hard mount. - Various fixes to the error handling in sunrpc - Don't report writepage()/writepages() errors twice" * tag 'nfs-for-5.3-3' of git://git.linux-nfs.org/projects/trondmy/linux-nfs: NFS: remove set but not used variable 'mapping' NFSv2: Fix write regression NFSv2: Fix eof handling NFS: Fix writepage(s) error handling to not report errors twice NFS: Fix spurious EIO read errors pNFS/flexfiles: Don't time out requests on hard mounts SUNRPC: Handle connection breakages correctly in call_status() Revert "NFSv4/flexfiles: Abort I/O early if the layout segment was invalidated" SUNRPC: Handle EADDRINUSE and ENOBUFS correctly pNFS/flexfiles: Turn off soft RPC calls SUNRPC: Don't handle errors if the bind/connect succeeded NFS: On fatal writeback errors, we need to call nfs_inode_remove_request() NFS: Fix initialisation of I/O result struct in nfs_pgio_rpcsetup NFS: Ensure O_DIRECT reports an error if the bytes read/written is 0 NFSv4/pnfs: Fix a page lock leak in nfs_pageio_resend() NFSv4: Fix return value in nfs_finish_open() NFSv4: Fix return values for nfs4_file_open() NFS: Don't refresh attributes with mounted-on-file information
| * | | | | SUNRPC: Handle connection breakages correctly in call_status()Trond Myklebust2019-08-261-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | If the connection breaks while we're waiting for a reply from the server, then we want to immediately try to reconnect. Fixes: ec6017d90359 ("SUNRPC fix regression in umount of a secure mount") Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
| * | | | | Revert "NFSv4/flexfiles: Abort I/O early if the layout segment was invalidated"Trond Myklebust2019-08-261-7/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This reverts commit a79f194aa4879e9baad118c3f8bb2ca24dbef765. The mechanism for aborting I/O is racy, since we are not guaranteed that the request is asleep while we're changing both task->tk_status and task->tk_action. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> Cc: stable@vger.kernel.org # v5.1
| * | | | | SUNRPC: Handle EADDRINUSE and ENOBUFS correctlyTrond Myklebust2019-08-261-3/+7
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | If a connect or bind attempt returns EADDRINUSE, that means we want to retry with a different port. It is not a fatal connection error. Similarly, ENOBUFS is not fatal, but just indicates a memory allocation issue. Retry after a short delay. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
| * | | | | SUNRPC: Don't handle errors if the bind/connect succeededTrond Myklebust2019-08-261-11/+24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Don't handle errors in call_bind_status()/call_connect_status() if it turns out that a previous call caused it to succeed. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> Cc: stable@vger.kernel.org # v5.1+
* | | | | | Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/netLinus Torvalds2019-08-2728-100/+186
|\ \ \ \ \ \ | |_|/ / / / |/| | | / / | | |_|/ / | |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Pull networking fixes from David Miller: 1) Use 32-bit index for tails calls in s390 bpf JIT, from Ilya Leoshkevich. 2) Fix missed EPOLLOUT events in TCP, from Eric Dumazet. Same fix for SMC from Jason Baron. 3) ipv6_mc_may_pull() should return 0 for malformed packets, not -EINVAL. From Stefano Brivio. 4) Don't forget to unpin umem xdp pages in error path of xdp_umem_reg(). From Ivan Khoronzhuk. 5) Fix sta object leak in mac80211, from Johannes Berg. 6) Fix regression by not configuring PHYLINK on CPU port of bcm_sf2 switches. From Florian Fainelli. 7) Revert DMA sync removal from r8169 which was causing regressions on some MIPS Loongson platforms. From Heiner Kallweit. 8) Use after free in flow dissector, from Jakub Sitnicki. 9) Fix NULL derefs of net devices during ICMP processing across collect_md tunnels, from Hangbin Liu. 10) proto_register() memory leaks, from Zhang Lin. 11) Set NLM_F_MULTI flag in multipart netlink messages consistently, from John Fastabend. * git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (66 commits) r8152: Set memory to all 0xFFs on failed reg reads openvswitch: Fix conntrack cache with timeout ipv4: mpls: fix mpls_xmit for iptunnel nexthop: Fix nexthop_num_path for blackhole nexthops net: rds: add service level support in rds-info net: route dump netlink NLM_F_MULTI flag missing s390/qeth: reject oversized SNMP requests sock: fix potential memory leak in proto_register() MAINTAINERS: Add phylink keyword to SFF/SFP/SFP+ MODULE SUPPORT xfrm/xfrm_policy: fix dst dev null pointer dereference in collect_md mode ipv4/icmp: fix rt dst dev null pointer dereference openvswitch: Fix log message in ovs conntrack bpf: allow narrow loads of some sk_reuseport_md fields with offset > 0 bpf: fix use after free in prog symbol exposure bpf: fix precision tracking in presence of bpf2bpf calls flow_dissector: Fix potential use-after-free on BPF_PROG_DETACH Revert "r8169: remove not needed call to dma_sync_single_for_device" ipv6: propagate ipv6_add_dev's error returns out of ipv6_find_idev net/ncsi: Fix the payload copying for the request coming from Netlink qed: Add cleanup in qed_slowpath_start() ...
| * | | | openvswitch: Fix conntrack cache with timeoutYi-Hung Wei2019-08-251-0/+13
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch addresses a conntrack cache issue with timeout policy. Currently, we do not check if the timeout extension is set properly in the cached conntrack entry. Thus, after packet recirculate from conntrack action, the timeout policy is not applied properly. This patch fixes the aforementioned issue. Fixes: 06bd2bdf19d2 ("openvswitch: Add timeout support to ct action") Reported-by: kbuild test robot <lkp@intel.com> Signed-off-by: Yi-Hung Wei <yihung.wei@gmail.com> Acked-by: Pravin B Shelar <pshelar@ovn.org> Signed-off-by: David S. Miller <davem@davemloft.net>
| * | | | ipv4: mpls: fix mpls_xmit for iptunnelAlexey Kodanev2019-08-251-4/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When using mpls over gre/gre6 setup, rt->rt_gw4 address is not set, the same for rt->rt_gw_family. Therefore, when rt->rt_gw_family is checked in mpls_xmit(), neigh_xmit() call is skipped. As a result, such setup doesn't work anymore. This issue was found with LTP mpls03 tests. Fixes: 1550c171935d ("ipv4: Prepare rtable for IPv6 gateway") Signed-off-by: Alexey Kodanev <alexey.kodanev@oracle.com> Reviewed-by: David Ahern <dsahern@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
| * | | | net: rds: add service level support in rds-infoZhu Yanjun2019-08-254-8/+22
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | >From IB specific 7.6.5 SERVICE LEVEL, Service Level (SL) is used to identify different flows within an IBA subnet. It is carried in the local route header of the packet. Before this commit, run "rds-info -I". The outputs are as below: " RDS IB Connections: LocalAddr RemoteAddr Tos SL LocalDev RemoteDev 192.2.95.3 192.2.95.1 2 0 fe80::21:28:1a:39 fe80::21:28:10:b9 192.2.95.3 192.2.95.1 1 0 fe80::21:28:1a:39 fe80::21:28:10:b9 192.2.95.3 192.2.95.1 0 0 fe80::21:28:1a:39 fe80::21:28:10:b9 " After this commit, the output is as below: " RDS IB Connections: LocalAddr RemoteAddr Tos SL LocalDev RemoteDev 192.2.95.3 192.2.95.1 2 2 fe80::21:28:1a:39 fe80::21:28:10:b9 192.2.95.3 192.2.95.1 1 1 fe80::21:28:1a:39 fe80::21:28:10:b9 192.2.95.3 192.2.95.1 0 0 fe80::21:28:1a:39 fe80::21:28:10:b9 " The commit fe3475af3bdf ("net: rds: add per rds connection cache statistics") adds cache_allocs in struct rds_info_rdma_connection as below: struct rds_info_rdma_connection { ... __u32 rdma_mr_max; __u32 rdma_mr_size; __u8 tos; __u32 cache_allocs; }; The peer struct in rds-tools of struct rds_info_rdma_connection is as below: struct rds_info_rdma_connection { ... uint32_t rdma_mr_max; uint32_t rdma_mr_size; uint8_t tos; uint8_t sl; uint32_t cache_allocs; }; The difference between userspace and kernel is the member variable sl. In the kernel struct, the member variable sl is missing. This will introduce risks. So it is necessary to use this commit to avoid this risk. Fixes: fe3475af3bdf ("net: rds: add per rds connection cache statistics") CC: Joe Jin <joe.jin@oracle.com> CC: JUNXIAO_BI <junxiao.bi@oracle.com> Suggested-by: Gerd Rausch <gerd.rausch@oracle.com> Signed-off-by: Zhu Yanjun <yanjun.zhu@oracle.com> Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
| * | | | net: route dump netlink NLM_F_MULTI flag missingJohn Fastabend2019-08-252-8/+11
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | An excerpt from netlink(7) man page, In multipart messages (multiple nlmsghdr headers with associated payload in one byte stream) the first and all following headers have the NLM_F_MULTI flag set, except for the last header which has the type NLMSG_DONE. but, after (ee28906) there is a missing NLM_F_MULTI flag in the middle of a FIB dump. The result is user space applications following above man page excerpt may get confused and may stop parsing msg believing something went wrong. In the golang netlink lib [0] the library logic stops parsing believing the message is not a multipart message. Found this running Cilium[1] against net-next while adding a feature to auto-detect routes. I noticed with multiple route tables we no longer could detect the default routes on net tree kernels because the library logic was not returning them. Fix this by handling the fib_dump_info_fnhe() case the same way the fib_dump_info() handles it by passing the flags argument through the call chain and adding a flags argument to rt_fill_info(). Tested with Cilium stack and auto-detection of routes works again. Also annotated libs to dump netlink msgs and inspected NLM_F_MULTI and NLMSG_DONE flags look correct after this. Note: In inet_rtm_getroute() pass rt_fill_info() '0' for flags the same as is done for fib_dump_info() so this looks correct to me. [0] https://github.com/vishvananda/netlink/ [1] https://github.com/cilium/ Fixes: ee28906fd7a14 ("ipv4: Dump route exceptions if requested") Signed-off-by: John Fastabend <john.fastabend@gmail.com> Reviewed-by: Stefano Brivio <sbrivio@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
| * | | | sock: fix potential memory leak in proto_register()zhanglin2019-08-251-10/+21
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | If protocols registered exceeded PROTO_INUSE_NR, prot will be added to proto_list, but no available bit left for prot in proto_inuse_idx. Changes since v2: * Propagate the error code properly Signed-off-by: zhanglin <zhang.lin16@zte.com.cn> Signed-off-by: David S. Miller <davem@davemloft.net>
| * | | | xfrm/xfrm_policy: fix dst dev null pointer dereference in collect_md modeHangbin Liu2019-08-241-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In decode_session{4,6} there is a possibility that the skb dst dev is NULL, e,g, with tunnel collect_md mode, which will cause kernel crash. Here is what the code path looks like, for GRE: - ip6gre_tunnel_xmit - ip6gre_xmit_ipv6 - __gre6_xmit - ip6_tnl_xmit - if skb->len - t->tun_hlen - eth_hlen > mtu; return -EMSGSIZE - icmpv6_send - icmpv6_route_lookup - xfrm_decode_session_reverse - decode_session4 - oif = skb_dst(skb)->dev->ifindex; <-- here - decode_session6 - oif = skb_dst(skb)->dev->ifindex; <-- here The reason is __metadata_dst_init() init dst->dev to NULL by default. We could not fix it in __metadata_dst_init() as there is no dev supplied. On the other hand, the skb_dst(skb)->dev is actually not needed as we called decode_session{4,6} via xfrm_decode_session_reverse(), so oif is not used by: fl4->flowi4_oif = reverse ? skb->skb_iif : oif; So make a dst dev check here should be clean and safe. v4: No changes. v3: No changes. v2: fix the issue in decode_session{4,6} instead of updating shared dst dev in {ip_md, ip6}_tunnel_xmit. Fixes: 8d79266bc48c ("ip6_tunnel: add collect_md mode to IPv6 tunnels") Signed-off-by: Hangbin Liu <liuhangbin@gmail.com> Tested-by: Jonathan Lemon <jonathan.lemon@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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