[PATCH] netfilter: nf_tables: fix memory leak in nf_tables_parse_netdev_hooks()

[Dan Carpenter]

Syzbot detected a leak in nf_tables_parse_netdev_hooks().  If the hook
already exists, then the error handling doesn't free the newest "hook".

Reported-by: syzbot+f9d4095107fc8749c69c@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: b75a3e8371bc ("netfilter: nf_tables: allow netdevice to be used only once per flowtable")
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
---
 net/netfilter/nf_tables_api.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 273f3838318b..7728e9fd5de4 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -1676,6 +1676,7 @@ static int nf_tables_parse_netdev_hooks(struct net *net,
 			goto err_hook;
 		}
 		if (nft_hook_list_find(hook_list, hook)) {
+			kfree(hook);
 			err = -EEXIST;
 			goto err_hook;
 		}
-- 
2.11.0