From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Date: Sat, 1 Nov 2014 13:32:28 +0000 (-0300)
Subject: [media] v4l: vb2: Fix race condition in _vb2_fop_release
X-Git-Tag: omap-for-v3.19/fixes-rc1~133^2~29
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=69c0e9c547817fef14871bc5c4645fad683f242e;p=pandora-kernel.git

[media] v4l: vb2: Fix race condition in _vb2_fop_release

The function releases the queue if the file being released is the queue
owner. The check reads the queue->owner field without taking the queue
lock, creating a race condition with functions that set the queue owner,
such as vb2_ioctl_reqbufs() for instance.

Fix this by moving the queue->owner check within the mutex protected
section.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Acked-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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