From: Simon Horman <horms@verge.net.au>
Date: Tue, 28 May 2013 20:34:29 +0000 (+0000)
Subject: net, ipv4, ipv6: Correct assignment of skb->network_header to skb->tail
X-Git-Tag: v3.11-rc1~16^2~274
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7cc461900549fc480eb133948649a1edb7eaaa6f;p=pandora-kernel.git

net, ipv4, ipv6: Correct assignment of skb->network_header to skb->tail

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 however skb->network_header is now
an offset.

This patch corrects the problem by adding a wrapper to return skb tail as
an offset regardless of the value of NET_SKBUFF_DATA_USES_OFFSET. It seems
that skb->tail that this offset may be more than 64k and some care has been
taken to treat such cases as an error.

Signed-off-by: Simon Horman <horms@verge.net.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
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