From: Jason Wang <jasowang@redhat.com>
Date: Fri, 11 Jan 2013 16:59:33 +0000 (+0000)
Subject: tuntap: forbid calling TUNSETIFF when detached
X-Git-Tag: v3.8-rc4~29^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7c0c3b1a8a175437991ccc898ed66ec5e4a96208;p=pandora-kernel.git

tuntap: forbid calling TUNSETIFF when detached

Michael points out that even after Stefan's fix the TUNSETIFF is still allowed
to create a new tap device. This because we only check tfile->tun but the
tfile->detached were introduced. Fix this by failing early in tun_set_iff() if
the file is detached. After this fix, there's no need to do the check again in
tun_set_iff(), so this patch removes it.

Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

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