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

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[ Upstream commit 03832a32bf8ff0a8305d94ddd3979835a807248f ]

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: 50f2db9e368f ("netfilter: nfnetlink: consolidate callback types")
Signed-off-by: Ziyang Xuan <william.xuanziyang@huawei.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Ziyang Xuan 2022-11-03 09:12:02 +08:00 committed by Greg Kroah-Hartman
parent 0bd20318da
commit e62cb1c093
1 changed files with 1 additions and 0 deletions
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net/netfilter/nfnetlink.c
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@ -290,6 +290,7 @@ 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;
}