From 3fcb6445dc08f42488287162e3b7009d405e9c5b Mon Sep 17 00:00:00 2001
From: Adam Jackson <ajax@redhat.com>
Date: Fri, 7 Mar 2008 08:29:49 -0500
Subject: [PATCH] Fix segfault when a monitor exists but has no modes.

Thanks to Zhenyu Wang for finding this.
---
 hw/xfree86/modes/xf86Crtc.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/hw/xfree86/modes/xf86Crtc.c b/hw/xfree86/modes/xf86Crtc.c
index 4d5d7b848..0bef5b42f 100644
--- a/hw/xfree86/modes/xf86Crtc.c
+++ b/hw/xfree86/modes/xf86Crtc.c
@@ -1678,6 +1678,9 @@ nextAspectMode(DisplayModePtr start, float aspect)
 {
     DisplayModePtr m = start;
 
+    if (!m)
+	return NULL;
+
     for (m = m->next; m; m = m->next)
 	if (aspectMatch(aspect, (float)m->HDisplay / (float)m->VDisplay))
 	    return m;