From: Eric Dumazet <edumazet@google.com>
Date: Thu, 11 Jan 2018 22:31:18 -0800
Subject: ipv6: ip6_make_skb() needs to clear cork.base.dst
Patch-mainline: v4.15-rc9
Git-commit: 95ef498d977bf44ac094778fd448b98af158a3e6
References: bsc#1076830

In my last patch, I missed fact that cork.base.dst was not initialized
in ip6_make_skb() :

If ip6_setup_cork() returns an error, we might attempt a dst_release()
on some random pointer.

Fixes: 862c03ee1deb ("ipv6: fix possible mem leaks in ipv6_make_skb()")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Michal Kubecek <mkubecek@suse.cz>

---
 net/ipv6/ip6_output.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index bdfd52d5e7fc..5b1e853439ea 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -1726,6 +1726,7 @@ struct sk_buff *ip6_make_skb(struct sock *sk,
 	cork.base.flags = 0;
 	cork.base.addr = 0;
 	cork.base.opt = NULL;
+	cork.base.dst = NULL;
 	v6_cork.opt = NULL;
 	err = ip6_setup_cork(sk, &cork, &v6_cork, ipc6, rt, fl6);
 	if (err) {
-- 
2.16.0