linux-kernel - [PATCH 5.8 05/16] net/sched: act_ct: Fix skb double-free in tcf_ct_handle

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Date:   Wed, 26 Aug 2020 14:02:42 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Alaa Hleihel <alaa@...lanox.com>,
        Roi Dayan <roid@...lanox.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 5.8 05/16] net/sched: act_ct: Fix skb double-free in tcf_ct_handle_fragments() error flow

From: Alaa Hleihel <alaa@...lanox.com>

[ Upstream commit eda814b97dfb8d9f4808eb2f65af9bd3705c4cae ]

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>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/sched/act_ct.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/sched/act_ct.c
+++ b/net/sched/act_ct.c
@@ -704,7 +704,7 @@ static int tcf_ct_handle_fragments(struc
 		err = ip_defrag(net, skb, user);
 		local_bh_enable();
 		if (err && err != -EINPROGRESS)
-			goto out_free;
+			return err;
 
 		if (!err)
 			*defrag = true;