linux-kernel - [PATCH 3.2 67/92] [media] V4L2: ov7670: fix a wrong index, potentially Oopsing the kernel from user-space

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Message-ID: <lsq.1402104389.756029732@decadent.org.uk>
Date:	Sat, 07 Jun 2014 02:26:29 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"Mauro Carvalho Chehab" <m.chehab@...sung.com>,
	"Jonathan Corbet" <corbet@....net>,
	"Guennadi Liakhovetski" <g.liakhovetski@....de>
Subject: [PATCH 3.2 67/92] [media] V4L2: ov7670: fix a wrong index,
 potentially Oopsing the kernel from user-space

3.2.60-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Guennadi Liakhovetski <g.liakhovetski@....de>

commit cfece5857ca51d1dcdb157017aba226f594e9dcf upstream.

Commit 75e2bdad8901a0b599e01a96229be922eef1e488 "ov7670: allow
configuration of image size, clock speed, and I/O method" uses a wrong
index to iterate an array. Apart from being wrong, it also uses an
unchecked value from user-space, which can cause access to unmapped
memory in the kernel, triggered by a normal desktop user with rights to
use V4L2 devices.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@....de>
Acked-by: Jonathan Corbet <corbet@....net>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@...sung.com>
[bwh: Backported to 3.2:
 - Adjust filename
 - win_sizes array is static, not per-device]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/media/video/ov7670.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/media/video/ov7670.c
+++ b/drivers/media/video/ov7670.c
@@ -937,7 +937,7 @@ static int ov7670_enum_framesizes(struct
 	 * windows that fall outside that.
 	 */
 	for (i = 0; i < N_WIN_SIZES; i++) {
-		struct ov7670_win_size *win = &ov7670_win_sizes[index];
+		struct ov7670_win_size *win = &ov7670_win_sizes[i];
 		if (info->min_width && win->width < info->min_width)
 			continue;
 		if (info->min_height && win->height < info->min_height)

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