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SubjectRe: [PATCH] gpsca: remove the risk of a division by zero
On Mon, Feb 09, 2015 at 10:16:25AM +0000, Luis de Bethencourt wrote:
> As reported by Peter Kovar, there's a potential risk of a division by zero on
> calls to jpeg_set_qual() when quality is zero.
>
> As quality can't be 0 or lower than that, add an extra clause to cover this
> special case.
>
> Signed-off-by: Luis de Bethencourt <luis.bg@samsung.com>
> ---
> drivers/media/usb/gspca/topro.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/media/usb/gspca/topro.c b/drivers/media/usb/gspca/topro.c
> index 5fcd1ee..c70ff40 100644
> --- a/drivers/media/usb/gspca/topro.c
> +++ b/drivers/media/usb/gspca/topro.c
> @@ -969,7 +969,9 @@ static void jpeg_set_qual(u8 *jpeg_hdr,
> {
> int i, sc;
>
> - if (quality < 50)
> + if (quality <= 0)
> + sc = 5000;
> + else if (quality < 50)
> sc = 5000 / quality;
> else
> sc = 200 - quality * 2;
> --
> 2.1.3
>

Reported here:
http://www.mail-archive.com/linux-media@vger.kernel.org/msg84989.html

Thanks :)
Luis


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