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[media] Guard a divide in v4l1 compat layer

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Hi,
  I managed to trigger a divide by 0 in the v4l compat code
with the mem2mem test module; I suspect perhaps it shouldn't
have been returning a 0 pixel wide picture, but either way it seems
right to guard this divide by 0 in the compatibility layer.

Tested on 2.6.36 (ubuntu build, but the code in this is the same as upstream),
but ***not tested with a real video device***.

Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
cc: stable.kernel.org
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Dr. David Alan Gilbert 2010-10-24 13:33:09 -03:00 committed by Mauro Carvalho Chehab
parent 52fae5eead
commit 910f5f05f9
1 changed files with 10 additions and 3 deletions
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13
drivers/media/video/v4l1-compat.c
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@ -645,9 +645,16 @@ static noinline long v4l1_compat_get_picture(
goto done;
}
pict->depth = ((fmt->fmt.pix.bytesperline << 3)
+ (fmt->fmt.pix.width - 1))
/ fmt->fmt.pix.width;
if (fmt->fmt.pix.width)
{
pict->depth = ((fmt->fmt.pix.bytesperline << 3)
+ (fmt->fmt.pix.width - 1))
/ fmt->fmt.pix.width;
} else {
err = -EINVAL;
goto done;
}
pict->palette = pixelformat_to_palette(
fmt->fmt.pix.pixelformat);
done: