From 32bac60519dab482cd3f44355563750a4521f4cb Mon Sep 17 00:00:00 2001
From: Brian Paul <brian.paul@tungstengraphics.com>
Date: Thu, 3 Jul 2003 03:02:44 +0000
Subject: [PATCH] tweak checks for display list zero

---
 src/mesa/main/dlist.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/mesa/main/dlist.c b/src/mesa/main/dlist.c
index 4399385cc18..8513b458018 100644
--- a/src/mesa/main/dlist.c
+++ b/src/mesa/main/dlist.c
@@ -4452,7 +4452,7 @@ execute_list( GLcontext *ctx, GLuint list )
    Node *n;
    GLboolean done;
 
-   if (!islist(ctx,list))
+   if (list == 0 || !islist(ctx,list))
       return;
 
    if (ctx->Driver.BeginCallList)
@@ -5354,6 +5354,11 @@ _mesa_CallList( GLuint list )
    if (MESA_VERBOSE & VERBOSE_API)
       _mesa_debug(ctx, "glCallList %d\n", list); 
 
+   if (list == 0) {
+      _mesa_error(ctx, GL_INVALID_VALUE, "glCallList(list==0)");
+      return;
+   }
+
 /*     mesa_print_display_list( list ); */
 
    save_compile_flag = ctx->CompileFlag;
-- 
2.11.0