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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, wenxu <wenxu@ucloud.cn>,
        "David S. Miller" <davem@davemloft.net>
Subject: [PATCH 5.4 56/71] net/sched: act_ct: fix err check for nf_conntrack_confirm
Date:   Thu, 22 Jul 2021 18:31:31 +0200
Message-Id: <20210722155619.765430454@linuxfoundation.org>
In-Reply-To: <20210722155617.865866034@linuxfoundation.org>
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From: wenxu <wenxu@ucloud.cn>

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 <wenxu@ucloud.cn>
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
@@ -474,7 +474,8 @@ static int tcf_ct_act(struct sk_buff *sk
 		/* 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;
 	}
 
 out_push: