From: Johannes Berg <johannes.berg@intel.com>
Date: Sun, 9 Dec 2012 23:41:06 +0000 (+0000)
Subject: ipv4: ip_check_defrag must not modify skb before unsharing
X-Git-Tag: v3.2.36~17
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3bbb42f09dd86794f0ae82bdcbd511810d4ff2db;p=pandora-kernel.git

ipv4: ip_check_defrag must not modify skb before unsharing

[ Upstream commit 1bf3751ec90cc3174e01f0d701e8449ce163d113 ]

ip_check_defrag() might be called from af_packet within the
RX path where shared SKBs are used, so it must not modify
the input SKB before it has unshared it for defragmentation.
Use skb_copy_bits() to get the IP header and only pull in
everything later.

The same is true for the other caller in macvlan as it is
called from dev->rx_handler which can also get a shared SKB.

Reported-by: Eric Leblond <eric@regit.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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