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netfilter: nfnetlink: fix potential dead lock in nfnetlink_rcv_msg()

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When type is NFNL_CB_MUTEX and -EAGAIN error occur in nfnetlink_rcv_msg(),
it does not execute nfnl_unlock(). That would trigger potential dead lock.

Fixes: 50f2db9e36 ("netfilter: nfnetlink: consolidate callback types")
Signed-off-by: Ziyang Xuan <william.xuanziyang@huawei.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
This commit is contained in:
Ziyang Xuan 2022-11-03 09:12:02 +08:00 committed by Florian Westphal
parent ce9e57feee
commit 03832a32bf
1 changed files with 1 additions and 0 deletions
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net/netfilter/nfnetlink.c
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@ -294,6 +294,7 @@ replay:
nfnl_lock(subsys_id);
if (nfnl_dereference_protected(subsys_id) != ss ||
nfnetlink_find_client(type, ss) != nc) {
nfnl_unlock(subsys_id);
err = -EAGAIN;
break;
}