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media: V4L2: ov7670: fix a wrong index, potentially Oopsing the kernel from user-space 

commit cfece5857ca51d1dcdb157017aba226f594e9dcf upstream.

Commit 75e2bdad89 "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@gmx.de>
Acked-by: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Guennadi Liakhovetski 2014-04-14 10:49:34 -03:00 committed by Greg Kroah-Hartman
parent 4f792a2972
commit 2e008074b2
1 changed files with 1 additions and 1 deletions
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2
drivers/media/i2c/ov7670.c
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@ -1110,7 +1110,7 @@ static int ov7670_enum_framesizes(struct v4l2_subdev *sd,
* windows that fall outside that.
*/
for (i = 0; i < n_win_sizes; i++) {
struct ov7670_win_size *win = &info->devtype->win_sizes[index];
struct ov7670_win_size *win = &info->devtype->win_sizes[i];
if (info->min_width && win->width < info->min_width)
continue;
if (info->min_height && win->height < info->min_height)