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netfilter: nf_tables: hold mutex on netns pre_exit path

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[ 3923b1e4406680d57da7e873da77b1683035d83f ]

clean_net() runs in workqueue while walking over the lists, grab mutex.

Fixes: 767d1216bff8 ("netfilter: nftables: fix possible UAF over chains from packet path in netns")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Pablo Neira Ayuso 2023-05-16 16:44:35 +02:00 committed by Greg Kroah-Hartman
parent 6236af6936
commit e0c1b35239
1 changed files with 2 additions and 0 deletions
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2
net/netfilter/nf_tables_api.c
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@ -7866,7 +7866,9 @@ static int __net_init nf_tables_init_net(struct net *net)
static void __net_exit nf_tables_pre_exit_net(struct net *net)
{
mutex_lock(&net->nft.commit_mutex);
__nft_release_hooks(net);
mutex_unlock(&net->nft.commit_mutex);
}
static void __net_exit nf_tables_exit_net(struct net *net)