| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.15 25/66] netfilter: nf_tables: hold mutex on netns pre_exit path | Date | Fri, 3 Jun 2022 19:43:05 +0200 |
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From: Pablo Neira Ayuso <pablo@netfilter.org>
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> --- net/netfilter/nf_tables_api.c | 4 ++++ 1 file changed, 4 insertions(+)
--- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -9746,7 +9746,11 @@ static int __net_init nf_tables_init_net static void __net_exit nf_tables_pre_exit_net(struct net *net) { + struct nftables_pernet *nft_net = nft_pernet(net); + + mutex_lock(&nft_net->commit_mutex); __nft_release_hooks(net); + mutex_unlock(&nft_net->commit_mutex); } static void __net_exit nf_tables_exit_net(struct net *net)
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