From 5e71d9d77c07fa7d4c42287a177f7b738d0cd4b9 Mon Sep 17 00:00:00 2001
From: Pablo Neira <pablo@netfilter.org>
Date: Mon, 3 Jun 2013 09:28:43 +0000
Subject: [PATCH] net: fix sk_buff head without data area

Eric Dumazet spotted that we have to check skb->head instead
of skb->data as skb->head points to the beginning of the
data area of the skbuff. Similarly, we have to initialize the
skb->head pointer, not skb->data in __alloc_skb_head.

After this fix, netlink crashes in the release path of the
sk_buff, so let's fix that as well.

This bug was introduced in (0ebd0ac net: add function to
allocate sk_buff head without data area).

Reported-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
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