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media: cx25840: fix a possible divide by zero in set_fmt callback 

If set_fmt callback is called with format->width or format->height set to
zero and HACTIVE_CNT or VACTIVE_CNT bits (respectively) in chip are zero
we will divide by zero later in this callback when we try to calculate
HSC or VSC values.

Fix this by explicitly rejecting these values.

Signed-off-by: Maciej S. Szmigiero <mail@maciej.szmigiero.name>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Maciej S. Szmigiero 2017-10-10 17:35:37 -04:00 committed by Mauro Carvalho Chehab
parent 7ff0613033
commit 4f1bdf0a75
1 changed files with 3 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/media/i2c/cx25840/cx25840-core.c
View File

@ -1395,8 +1395,9 @@ static int cx25840_set_fmt(struct v4l2_subdev *sd,
* height. Without that margin the cx23885 fails in this
* check.
*/
if ((fmt->width * 16 < Hsrc) || (Hsrc < fmt->width) ||
(Vlines * 8 < Vsrc) || (Vsrc + 1 < Vlines)) {
if ((fmt->width == 0) || (Vlines == 0) ||
(fmt->width * 16 < Hsrc) || (Hsrc < fmt->width) ||
(Vlines * 8 < Vsrc) || (Vsrc + 1 < Vlines)) {
v4l_err(client, "%dx%d is not a valid size!\n",
fmt->width, fmt->height);
return -ERANGE;