Message ID | 1345384050.5158.208.camel@edumazet-glaptop |
---|---|
State | Accepted, archived |
Delegated to: | David Miller |
Headers | show |
From: Eric Dumazet <eric.dumazet@gmail.com> Date: Sun, 19 Aug 2012 15:47:30 +0200 > From: Eric Dumazet <edumazet@google.com> > > ip6gre_err() miscomputes grehlen (sizeof(ipv6h) is 4 or 8, > not 40 as expected), and should take into account 'offset' parameter. > > Also uses pskb_may_pull() to cope with some fragged skbs > > Signed-off-by: Eric Dumazet <edumazet@google.com> > Cc: Dmitry Kozlov <xeb@mail.ru> Applied, thanks Eric. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/net/ipv6/ip6_gre.c b/net/ipv6/ip6_gre.c index a84ad5d..424d11a 100644 --- a/net/ipv6/ip6_gre.c +++ b/net/ipv6/ip6_gre.c @@ -415,8 +415,8 @@ static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt, u8 type, u8 code, int offset, __be32 info) { const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)skb->data; - __be16 *p = (__be16 *)(ipv6h + 1); - int grehlen = sizeof(ipv6h) + 4; + __be16 *p = (__be16 *)(skb->data + offset); + int grehlen = offset + 4; struct ip6_tnl *t; __be16 flags; @@ -432,8 +432,10 @@ static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt, } /* If only 8 bytes returned, keyed message will be dropped here */ - if (skb_headlen(skb) < grehlen) + if (!pskb_may_pull(skb, grehlen)) return; + ipv6h = (const struct ipv6hdr *)skb->data; + p = (__be16 *)(skb->data + offset); rcu_read_lock();