Subject: [PATCH 06/37] ipv6: ip6_make_skb() needs to clear cork.base.dst

From: Eric Dumazet <[email-masked]>
Date: Thu, 11 Jan 2018 22:31:18 -0800

[ Upstream commit 95ef498d977bf44ac094778fd448b98af158a3e6 ]

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 <[email-masked]>
Reported-by: syzbot <[email-masked]>
Signed-off-by: David S. Miller <[email-masked]>
---
 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 7ef142706d14..3763dc01e374 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -1735,6 +1735,7 @@ 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) {
-- 
2.14.3