tipc: fix a double kfree_skb()

BugLink: https://bugs.launchpad.net/bugs/1837257
[ Upstream commit acb4a33e9856d5fa3384b87d3d8369229be06d31 ]

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@syzkaller.appspotmail.com
Cc: Ying Xue <ying.xue@windriver.com>
Cc: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Andrea Righi <andrea.righi@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>

diff --git a/net/tipc/udp_media.c b/net/tipc/udp_media.c
index 3deabcab4882165b668f65319a3555027bf3b292..8bf40cd9fbf10068521640a9806803923eb5c953 100644 (file)
--- a/net/tipc/udp_media.c
+++ b/net/tipc/udp_media.c
@@ -243,10 +243,8 @@ 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: