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)