Commit b87fb39e authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
Browse files

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: default avatarEric Dumazet <>
Cc: Dmitry Kozlov <>
Signed-off-by: default avatarDavid S. Miller <>
parent ef8531b6
......@@ -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))
ipv6h = (const struct ipv6hdr *)skb->data;
p = (__be16 *)(skb->data + offset);
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