From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Mon, 26 Jul 2010 20:09:16 +0000 (-0700)
Subject: netlink: netlink_recvmsg() fix
X-Git-Tag: v2.6.36-rc1~571^2~97
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1235f504aaba2ebeabc863fdb3ceac764a317d47;p=pandora-kernel.git

netlink: netlink_recvmsg() fix

commit 1dacc76d0014
(net/compat/wext: send different messages to compat tasks)
introduced a race condition on netlink, in case MSG_PEEK is used.

An skb given by skb_recv_datagram() might be shared, we must copy it
before any modification, or risk fatal corruption.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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