From 324c1ed4069c7d49d0ff7c63261281148f9b6cd8 Mon Sep 17 00:00:00 2001
From: marha <marha@users.sourceforge.net>
Date: Mon, 5 Sep 2011 08:42:34 +0200
Subject: git update libxcb mesa 5 sep 2011

---
 mesalib/src/mesa/main/bufferobj.c | 24 +++++++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

(limited to 'mesalib/src/mesa/main/bufferobj.c')

diff --git a/mesalib/src/mesa/main/bufferobj.c b/mesalib/src/mesa/main/bufferobj.c
index c453f9c85..a30340174 100644
--- a/mesalib/src/mesa/main/bufferobj.c
+++ b/mesalib/src/mesa/main/bufferobj.c
@@ -1004,6 +1004,12 @@ _mesa_MapBufferARB(GLenum target, GLenum access)
       return NULL;
    }
 
+   if (!bufObj->Size) {
+      _mesa_error(ctx, GL_OUT_OF_MEMORY,
+                  "glMapBuffer(buffer size = 0)");
+      return NULL;
+   }
+
    ASSERT(ctx->Driver.MapBufferRange);
    map = ctx->Driver.MapBufferRange(ctx, 0, bufObj->Size, accessFlags, bufObj);
    if (!map) {
@@ -1410,7 +1416,23 @@ _mesa_MapBufferRange(GLenum target, GLintptr offset, GLsizeiptr length,
                   "glMapBufferRange(buffer already mapped)");
       return NULL;
    }
-      
+
+   if (!bufObj->Size) {
+      _mesa_error(ctx, GL_OUT_OF_MEMORY,
+                  "glMapBufferRange(buffer size = 0)");
+      return NULL;
+   }
+
+   /* Mapping zero bytes should return a non-null pointer. */
+   if (!length) {
+      static long dummy = 0;
+      bufObj->Pointer = &dummy;
+      bufObj->Length = length;
+      bufObj->Offset = offset;
+      bufObj->AccessFlags = access;
+      return bufObj->Pointer;
+   }
+
    ASSERT(ctx->Driver.MapBufferRange);
    map = ctx->Driver.MapBufferRange(ctx, offset, length, access, bufObj);
    if (!map) {
-- 
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