From: Eric W. Biederman <ebiederm@xmission.com>
Date: Tue, 20 Jan 2009 10:57:48 +0000 (+0000)
Subject: tun: Fix races in tun_set_iff
X-Git-Tag: v2.6.30-rc1~662^2~922
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a7385ba21102a90f902055f9f185ca02bf62fa43;p=pandora-kernel.git

tun: Fix races in tun_set_iff

It is possible for two different tasks with access to the same file
descriptor to call tun_set_iff on it at the same time and race to
attach to a tap device.  Prevent this by placing all of the logic to
attach to a file descriptor in one function and testing the file
descriptor to be certain it is not already attached to another tun
device.

Signed-off-by: Eric W. Biederman <ebiederm@aristanetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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