ipv6: fix a potential use after free in ip6_offload.c

pskb_may_pull() maybe change skb->data and make opth pointer oboslete, so set the opth again Signed-off-by: Li RongQing <roy.qing.li@gmail.com> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
mariux64 · Oct 18, 2014 · fc6fb41 · fc6fb41
1 parent b4e3cef
commit fc6fb41
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/net/ipv6/ip6_offload.c b/net/ipv6/ip6_offload.c
@@ -46,6 +46,7 @@ static int ipv6_gso_pull_exthdrs(struct sk_buff *skb, int proto)
 		if (unlikely(!pskb_may_pull(skb, len)))
 			break;
 
+		opth = (void *)skb->data;
 		proto = opth->nexthdr;
 		__skb_pull(skb, len);
 	}