From 01bc98e313b8ee62c506d0f8f408d54b71d1dfa6 Mon Sep 17 00:00:00 2001
From: Julien Cristau <jcristau@debian.org>
Date: Sat, 3 Jul 2010 19:42:26 +0100
Subject: glx: make sure screen is non-negative in validGlxScreen
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Reviewed-by: Adam Jackson <ajax@redhat.com>
Reviewed-by: Kristian Høgsberg <krh@bitplanet.net>
Reviewed-by: Daniel Stone <daniel@fooishbar.org>
Signed-off-by: Julien Cristau <jcristau@debian.org>
(cherry picked from commit 3f0d3f4d97bce75c1828635c322b6560a45a037f)
---
 glx/glxcmds.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/glx/glxcmds.c b/glx/glxcmds.c
index b1061a8c2..3eae1aac7 100644
--- a/glx/glxcmds.c
+++ b/glx/glxcmds.c
@@ -58,7 +58,7 @@ 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;
-- 
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