netdev - [Patch net] tipc: fix a double kfree

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Date:   Mon, 10 Dec 2018 12:45:45 -0800
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     netdev@...r.kernel.org
Cc:     Cong Wang <xiyou.wangcong@...il.com>,
        Ying Xue <ying.xue@...driver.com>,
        Jon Maloy <jon.maloy@...csson.com>
Subject: [Patch net] tipc: fix a double kfree_skb()

tipc_udp_xmit() drops the packet on error, there is no
need to drop it again.

Fixes: ef20cd4dd163 ("tipc: introduce UDP replicast")
Reported-and-tested-by: syzbot+eae585ba2cc2752d3704@...kaller.appspotmail.com
Cc: Ying Xue <ying.xue@...driver.com>
Cc: Jon Maloy <jon.maloy@...csson.com>
Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>
---
 net/tipc/udp_media.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/net/tipc/udp_media.c b/net/tipc/udp_media.c
index 10dc59ce9c82..1b1ba1310ea7 100644
--- a/net/tipc/udp_media.c
+++ b/net/tipc/udp_media.c
@@ -245,10 +245,8 @@ static int tipc_udp_send_msg(struct net *net, struct sk_buff *skb,
 		}
 
 		err = tipc_udp_xmit(net, _skb, ub, src, &rcast->addr);
-		if (err) {
-			kfree_skb(_skb);
+		if (err)
 			goto out;
-		}
 	}
 	err = 0;
 out:
-- 
2.19.2