From f44baf51d9e8616acd9b929d9cfef83a4a3ad00a Mon Sep 17 00:00:00 2001
From: Matthias Clasen <mclasen@redhat.com>
Date: Mon, 25 Jul 2016 08:32:24 -0400
Subject: [PATCH] Avoid a division by zero

It appears that xvfb returns nonsense in its xrandr resources.
Avoid a crash when that happens.

https://bugzilla.gnome.org/show_bug.cgi?id=768999
---
 gdk/x11/gdkscreen-x11.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/gdk/x11/gdkscreen-x11.c b/gdk/x11/gdkscreen-x11.c
index 34dfcccd58..c189053c92 100644
--- a/gdk/x11/gdkscreen-x11.c
+++ b/gdk/x11/gdkscreen-x11.c
@@ -474,7 +474,8 @@ init_randr15 (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;
                 }
             }