diff options
| author | Hans Schillstrom <hans.schillstrom@ericsson.com> | 2011-06-13 09:06:57 +0200 |
|---|---|---|
| committer | Simon Horman <horms@verge.net.au> | 2011-06-13 10:41:47 +0200 |
| commit | 8f4e0a18682d91abfad72ede3d3cb5f3ebdf54b4 (patch) | |
| tree | b2b5ec39519bbf6416ae021f108739290e565b50 /net | |
| parent | netfilter: use unsigned variables for packet lengths in ip[6]_queue. (diff) | |
| download | linux-8f4e0a18682d91abfad72ede3d3cb5f3ebdf54b4.tar.xz linux-8f4e0a18682d91abfad72ede3d3cb5f3ebdf54b4.zip | |
IPVS netns exit causes crash in conntrack
Quote from Patric Mc Hardy
"This looks like nfnetlink.c excited and destroyed the nfnl socket, but
ip_vs was still holding a reference to a conntrack. When the conntrack
got destroyed it created a ctnetlink event, causing an oops in
netlink_has_listeners when trying to use the destroyed nfnetlink
socket."
If nf_conntrack_netlink is loaded before ip_vs this is not a problem.
This patch simply avoids calling ip_vs_conn_drop_conntrack()
when netns is dying as suggested by Julian.
Signed-off-by: Hans Schillstrom <hans.schillstrom@ericsson.com>
Signed-off-by: Simon Horman <horms@verge.net.au>
Diffstat (limited to 'net')
| -rw-r--r-- | net/netfilter/ipvs/ip_vs_conn.c | 10 | ||||
| -rw-r--r-- | net/netfilter/ipvs/ip_vs_core.c | 1 |
2 files changed, 10 insertions, 1 deletions
diff --git a/net/netfilter/ipvs/ip_vs_conn.c b/net/netfilter/ipvs/ip_vs_conn.c index bf28ac2fc99b..782db275ac53 100644 --- a/net/netfilter/ipvs/ip_vs_conn.c +++ b/net/netfilter/ipvs/ip_vs_conn.c @@ -776,8 +776,16 @@ static void ip_vs_conn_expire(unsigned long data) if (cp->control) ip_vs_control_del(cp); - if (cp->flags & IP_VS_CONN_F_NFCT) + if (cp->flags & IP_VS_CONN_F_NFCT) { ip_vs_conn_drop_conntrack(cp); + /* Do not access conntracks during subsys cleanup + * because nf_conntrack_find_get can not be used after + * conntrack cleanup for the net. + */ + smp_rmb(); + if (ipvs->enable) + ip_vs_conn_drop_conntrack(cp); + } ip_vs_pe_put(cp->pe); kfree(cp->pe_data); diff --git a/net/netfilter/ipvs/ip_vs_core.c b/net/netfilter/ipvs/ip_vs_core.c index 55af2242bccd..24c28d238dcb 100644 --- a/net/netfilter/ipvs/ip_vs_core.c +++ b/net/netfilter/ipvs/ip_vs_core.c @@ -1945,6 +1945,7 @@ static void __net_exit __ip_vs_dev_cleanup(struct net *net) { EnterFunction(2); net_ipvs(net)->enable = 0; /* Disable packet reception */ + smp_wmb(); __ip_vs_sync_cleanup(net); LeaveFunction(2); } |