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[PATCH 3.16 119/233] ipv6: Fix leak in ipv6_gso_segment().

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  [PATCH 3.16 119/233] ipv6: Fix leak in ipv6_gso_segment(). Ben Hutchings <ben@decadent.org.uk> - 2017-09-10 01:40 +0200

#1729862 — [PATCH 3.16 119/233] ipv6: Fix leak in ipv6_gso_segment().

3.16.48-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: "David S. Miller" <davem@davemloft.net>

commit e3e86b5119f81e5e2499bea7ea1ebe8ac6aab789 upstream.

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")
Reported-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
 net/ipv6/ip6_offload.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/net/ipv6/ip6_offload.c
+++ b/net/ipv6/ip6_offload.c
@@ -144,8 +144,10 @@ static struct sk_buff *ipv6_gso_segment(
 
 		if (udpfrag) {
 			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 *)((u8 *)ipv6h + err);
 			fptr->frag_off = htons(offset);
 			if (skb->next != NULL)

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