[media] gpsca: remove the risk of a division by zero

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>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

diff --git a/drivers/media/usb/gspca/topro.c b/drivers/media/usb/gspca/topro.c
index 5fcd1eec2004ae97b1ed61df808cf3e97bc1adf4..c70ff406b07ac55cf6f48b2741930b39afa2ca2d 100644 (file)
--- 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;