diff options
| author | Eric Dumazet <edumazet@google.com> | 2012-08-19 03:47:30 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-08-22 22:48:32 -0700 |
| commit | b87fb39e399137257a6db3224ea854117e9486e9 (patch) | |
| tree | a4373882fec7b443510d3c5a20c5c16839d71ae1 /net | |
| parent | ef8531b64c3e2443da52e9f05d74a988230eedc5 (diff) | |
ipv6: gre: fix ip6gre_err()
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>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv6/ip6_gre.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/net/ipv6/ip6_gre.c b/net/ipv6/ip6_gre.c index a84ad5dc4fc..424d11a4e7f 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(); |