netdev - [PATCH net] net/sched: act_ct: Fix skb double-free in tcf_ct_handle

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Message-Id: <20200819152410.1152049-1-alaa@mellanox.com>
Date:   Wed, 19 Aug 2020 18:24:10 +0300
From:   Alaa Hleihel <alaa@...lanox.com>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, xiyou.wangcong@...il.com,
        marcelo.leitner@...il.com, Roi Dayan <roid@...lanox.com>
Subject: [PATCH net] net/sched: act_ct: Fix skb double-free in tcf_ct_handle_fragments() error flow

tcf_ct_handle_fragments() shouldn't free the skb when ip_defrag() call
fails. Otherwise, we will cause a double-free bug.
In such cases, just return the error to the caller.

Fixes: b57dc7c13ea9 ("net/sched: Introduce action ct")
Signed-off-by: Alaa Hleihel <alaa@...lanox.com>
Reviewed-by: Roi Dayan <roid@...lanox.com>
---
 net/sched/act_ct.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/sched/act_ct.c b/net/sched/act_ct.c
index e6ad42b11835..2c3619165680 100644
--- a/net/sched/act_ct.c
+++ b/net/sched/act_ct.c
@@ -704,7 +704,7 @@ static int tcf_ct_handle_fragments(struct net *net, struct sk_buff *skb,
 		err = ip_defrag(net, skb, user);
 		local_bh_enable();
 		if (err && err != -EINPROGRESS)
-			goto out_free;
+			return err;
 
 		if (!err) {
 			*defrag = true;
-- 
1.8.3.1