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| author | Chen Zhongjin <chenzhongjin@huawei.com> | 2022-11-01 10:37:22 +0100 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2022-11-03 04:42:09 +0100 |
| commit | 62ff373da2534534c55debe6c724c7fe14adb97f (patch) | |
| tree | 2ffec044f3b984197b80af81cfaca4c67ff2aca3 /net/smc | |
| parent | stmmac: dwmac-loongson: fix invalid mdio_node (diff) | |
| download | linux-62ff373da2534534c55debe6c724c7fe14adb97f.tar.xz linux-62ff373da2534534c55debe6c724c7fe14adb97f.zip | |
net/smc: Fix possible leaked pernet namespace in smc_init()
In smc_init(), register_pernet_subsys(&smc_net_stat_ops) is called
without any error handling.
If it fails, registering of &smc_net_ops won't be reverted.
And if smc_nl_init() fails, &smc_net_stat_ops itself won't be reverted.
This leaves wild ops in subsystem linkedlist and when another module
tries to call register_pernet_operations() it triggers page fault:
BUG: unable to handle page fault for address: fffffbfff81b964c
RIP: 0010:register_pernet_operations+0x1b9/0x5f0
Call Trace:
<TASK>
register_pernet_subsys+0x29/0x40
ebtables_init+0x58/0x1000 [ebtables]
...
Fixes: 194730a9beb5 ("net/smc: Make SMC statistics network namespace aware")
Signed-off-by: Chen Zhongjin <chenzhongjin@huawei.com>
Reviewed-by: Tony Lu <tonylu@linux.alibaba.com>
Reviewed-by: Wenjia Zhang <wenjia@linux.ibm.com>
Link: https://lore.kernel.org/r/20221101093722.127223-1-chenzhongjin@huawei.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/smc')
| -rw-r--r-- | net/smc/af_smc.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c index 3ccbf3c201cd..e12d4fa5aece 100644 --- a/net/smc/af_smc.c +++ b/net/smc/af_smc.c @@ -3380,14 +3380,14 @@ static int __init smc_init(void) rc = register_pernet_subsys(&smc_net_stat_ops); if (rc) - return rc; + goto out_pernet_subsys; smc_ism_init(); smc_clc_init(); rc = smc_nl_init(); if (rc) - goto out_pernet_subsys; + goto out_pernet_subsys_stat; rc = smc_pnet_init(); if (rc) @@ -3480,6 +3480,8 @@ out_pnet: smc_pnet_exit(); out_nl: smc_nl_exit(); +out_pernet_subsys_stat: + unregister_pernet_subsys(&smc_net_stat_ops); out_pernet_subsys: unregister_pernet_subsys(&smc_net_ops); |