From: wenxu <redacted>

commit 8955b90c3cdad199137809aac8ccbbb585355913 upstream.

The confirm operation should be checked. If there are any failed,
the packet should be dropped like in ovs and netfilter.

Fixes: b57dc7c13ea9 ("net/sched: Introduce action ct")
Signed-off-by: wenxu <redacted>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/sched/act_ct.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/net/sched/act_ct.c
+++ b/net/sched/act_ct.c

@@ -1023,7 +1023,8 @@ do_nat:
 		/* This will take care of sending queued events
 		 * even if the connection is already confirmed.
 		 */
-		nf_conntrack_confirm(skb);
+		if (nf_conntrack_confirm(skb) != NF_ACCEPT)
+			goto drop;
 	}
 
 	if (!skip_add)