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ipv6: Correct comparisons and calculations using skb->tail and skb-transport_header

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This corrects an regression introduced by "net: Use 16bits for *_headers
fields of struct skbuff" when NET_SKBUFF_DATA_USES_OFFSET is not set. In
that case skb->tail will be a pointer whereas skb->transport_header
will be an offset from head. This is corrected by using wrappers that
ensure that comparisons and calculations are always made using pointers.

Signed-off-by: Simon Horman <horms@verge.net.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Simon Horman
2013-05-28 20:34:26 +00:00
committed by David S. Miller
parent ced14f6804
commit 29a3cad5c6
8 changed files with 19 additions and 13 deletions
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2
net/ipv6/icmp.c
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@@ -399,7 +399,7 @@ static void icmp6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info)
int err = 0;
if ((u8 *)hdr < skb->head ||
(skb->network_header + sizeof(*hdr)) > skb->tail)
(skb_network_header(skb) + sizeof(*hdr)) > skb_tail_pointer(skb))
return;
/*