From: Pavel Roskin <plroskin@gmail.com>
Date: Thu, 8 Mar 2018 14:58:42 +0000 (+0100)
Subject: x11: Avoid a division by zero
X-Git-Tag: archive/raspbian/3.24.39-1+rpi1~1^2~65^2~37^2~18
X-Git-Url: https://dgit.raspbian.org/%22http://www.example.com/cgi/%22/%22http:/www.example.com/cgi/%22?a=commitdiff_plain;h=cc967849f7653c697c33571a1a6a55e9ffd966ff;p=gtk%2B3.0.git

x11: Avoid a division by zero

This is similar to f44baf51d9e8616a but for RandR 1.3 servers like
x11rdp and Windows Exceed which don't return a refresh rate. Avoid a
crash when that happens.

https://bugzilla.gnome.org/show_bug.cgi?id=775546
---

diff --git a/gdk/x11/gdkscreen-x11.c b/gdk/x11/gdkscreen-x11.c
index 20fd27531e..272cecd7aa 100644
--- a/gdk/x11/gdkscreen-x11.c
+++ b/gdk/x11/gdkscreen-x11.c
@@ -658,7 +658,8 @@ init_randr13 (GdkScreen *screen, gboolean *changed)
               XRRModeInfo *xmode = &resources->modes[j];
               if (xmode->id == crtc->mode)
                 {
-                  refresh_rate = (1000 * xmode->dotClock) / (xmode->hTotal *xmode->vTotal);
+                  if (xmode->hTotal != 0 && xmode->vTotal != 0)
+                    refresh_rate = (1000 * xmode->dotClock) / (xmode->hTotal * xmode->vTotal);
                   break;
                 }
             }