Subject: [PATCH 11/22] net/sched: act_ct: Fix skb double-free in tcf_ct_handle_fragments() error flow

From: Alaa Hleihel <[email-masked]>
Date: Wed, 19 Aug 2020 18:24:10 +0300

[ 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 <[email-masked]>
Reviewed-by: Roi Dayan <[email-masked]>
Signed-off-by: David S. Miller <[email-masked]>
---
 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 417526d7741b..16bc5b0d1eaa 100644
--- a/net/sched/act_ct.c
+++ b/net/sched/act_ct.c
@@ -702,7 +702,7 @@ 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;
-- 
2.26.2