From: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
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@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/netfilter/nf_tables_api.c | 2 ++
1 file changed, 2 insertions(+)
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -8983,7 +8983,9 @@ static int __net_init nf_tables_init_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)
