From 4b21342d231aa7598111d7f0d39906a8b2306162 Mon Sep 17 00:00:00 2001
From: "David S. Miller" <davem@davemloft.net>
Date: Sun, 4 Jun 2017 21:41:10 -0400
Subject: [PATCH] ipv6: Fix leak in ipv6_gso_segment().

[ Upstream commit e3e86b5119f81e5e2499bea7ea1ebe8ac6aab789 ]

If ip6_find_1stfragopt() fails and we return an error we have to free
up 'segs' because nobody else is going to.

Fixes: 2423496af35d ("ipv6: Prevent overrun when parsing v6 header options")
Change-Id: I1ab8eb06aac21a43c243d52032cdae9f8eb7a9f2
Reported-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/ipv6/ip6_offload.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/ipv6/ip6_offload.c b/net/ipv6/ip6_offload.c
index ac18723d6b7c..9408fcee3c30 100644
--- a/net/ipv6/ip6_offload.c
+++ b/net/ipv6/ip6_offload.c
@@ -126,8 +126,10 @@ static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb,
 					   sizeof(*ipv6h));
 		if (proto == IPPROTO_UDP) {
 			int err = ip6_find_1stfragopt(skb, &prevhdr);
-			if (err < 0)
+			if (err < 0) {
+				kfree_skb_list(segs);
 				return ERR_PTR(err);
+			}
 			fptr = (struct frag_hdr *)(skb_network_header(skb) +
 				err);
 			fptr->frag_off = htons(offset);