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V4L/DVB: uvcvideo: Prevent division by 0 when control step value is 0

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commit cf7a50eeb6 upstream.

The control step values reported by the device are used as a divisor
unchecked, which can result in a division by zero.

Check the step value and make it 1 when null.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Laurent Pinchart
2010-04-25 16:27:14 -03:00
committed by Greg Kroah-Hartman
parent 135b48da0c
commit eaeb91e532
1 changed files with 2 additions and 0 deletions
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2
drivers/media/video/uvc/uvc_ctrl.c
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@@ -1047,6 +1047,8 @@ int uvc_ctrl_set(struct uvc_video_chain *chain,
uvc_ctrl_data(ctrl, UVC_CTRL_DATA_MAX));
step = mapping->get(mapping, UVC_GET_RES,
uvc_ctrl_data(ctrl, UVC_CTRL_DATA_RES));
if (step == 0)
step = 1;
xctrl->value = min + (xctrl->value - min + step/2) / step * step;
xctrl->value = clamp(xctrl->value, min, max);