linux-kernel - [PATCH 27/91] uvcvideo: Remove buffers from the queues when freeing

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Date:	Sun, 05 Feb 2012 23:10:16 +0100
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Sjoerd Simons <sjoerd.simons@...labora.co.uk>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Mauro Carvalho Chehab <mchehab@...hat.com>,
	Greg KH <gregkh@...uxfoundation.org>
Subject: [PATCH 27/91] uvcvideo: Remove buffers from the queues when freeing

2.6.27-longterm review patch.  If anyone has any objections, please let us know.

------------------

commit 8ca2c80b170c47eeb55f0c2a0f2b8edf85f35d49 upstream.

When freeing memory for the video buffers also remove them from the
irq & main queues.

This fixes an oops when doing the following:

open ("/dev/video", ..)
VIDIOC_REQBUFS
VIDIOC_QBUF
VIDIOC_REQBUFS
close ()

As the second VIDIOC_REQBUFS will cause the list entries of the buffers
to be cleared while they still hang around on the main and irc queues

Signed-off-by: Sjoerd Simons <sjoerd.simons@...labora.co.uk>
Acked-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
 drivers/media/video/uvc/uvc_queue.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

Index: longterm-2.6.27/drivers/media/video/uvc/uvc_queue.c
===================================================================
--- longterm-2.6.27.orig/drivers/media/video/uvc/uvc_queue.c	2012-02-05 22:34:34.215915503 +0100
+++ longterm-2.6.27/drivers/media/video/uvc/uvc_queue.c	2012-02-05 22:34:38.711914474 +0100
@@ -165,6 +165,8 @@
 	}
 
 	if (queue->count) {
+		uvc_queue_cancel(queue, 0);
+		INIT_LIST_HEAD(&queue->mainqueue);
 		vfree(queue->mem);
 		queue->count = 0;
 	}


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