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netfilter: nf_tables: hold mutex on netns pre_exit path

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commit 3923b1e4406680d57da7e873da77b1683035d83f upstream.

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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Pablo Neira Ayuso 2022-05-30 18:24:05 +02:00 committed by Greg Kroah-Hartman
parent 9e8d927cfa
commit 8b7454dd98
1 changed files with 2 additions and 0 deletions
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net/netfilter/nf_tables_api.c
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@ -8983,7 +8983,9 @@ 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)