ipv6: Fix leak in ipv6_gso_segment().

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>

1 files changed, 3 insertions, 1 deletions

diff --git a/net/ipv6/ip6_offload.c b/net/ipv6/ip6_offload.c
index 280268f1dd7b..cdb3728faca7 100644
--- a/net/ipv6/ip6_offload.c
+++ b/net/ipv6/ip6_offload.c
@@ -116,8 +116,10 @@ static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb,
 
                 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)