From 03eda3d567e017b0a3a7dba276106955da1205d9 Mon Sep 17 00:00:00 2001
From: Julien Cristau <jcristau@debian.org>
Date: Sat, 3 Jul 2010 19:42:26 +0100
Subject: [PATCH 1/3] glx: make sure screen is non-negative in validGlxScreen

---
 glx/glxcmds.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/glx/glxcmds.c b/glx/glxcmds.c
index 9e5b213..1756029 100644
--- a/glx/glxcmds.c
+++ b/glx/glxcmds.c
@@ -57,7 +57,7 @@ validGlxScreen(ClientPtr client, int screen, __GLXscreen **pGlxScreen, int *err)
     /*
     ** Check if screen exists.
     */
-    if (screen >= screenInfo.numScreens) {
+    if (screen < 0 || screen >= screenInfo.numScreens) {
 	client->errorValue = screen;
 	*err = BadValue;
 	return FALSE;
-- 
1.7.1