From: Amit Shah <amit.shah@redhat.com>
Date: Fri, 4 Mar 2011 03:34:33 +0000 (+1030)
Subject: virtio: console: Don't access vqs if device was unplugged
X-Git-Tag: v2.6.37.4~29
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=310f5e480c6facfdf9ee9e6952e490eebd3d8d55;p=pandora-kernel.git

virtio: console: Don't access vqs if device was unplugged

commit d7a62cd0332115d4c7c4689abea0d889a30d8349 upstream.

If a virtio-console device gets unplugged while a port is open, a
subsequent close() call on the port accesses vqs to free up buffers.
This can lead to a crash.

The buffers are already freed up as a result of the call to
unplug_ports() from virtcons_remove().  The fix is to simply not access
vq information if port->portdev is NULL.

Reported-by: juzhang <juzhang@redhat.com>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

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