From: Luis de Bethencourt <luis@debethencourt.com>
Date: Mon, 9 Feb 2015 10:16:25 +0000 (-0300)
Subject: [media] gpsca: remove the risk of a division by zero
X-Git-Tag: v4.2-rc8~12^2~971
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=d6d4c0e00fe559ef54b414e2e6266beaa50b4d8e;p=platform%2Fkernel%2Flinux-exynos.git

[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 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;