From 3362c7d9b61462855f1e7d67da5d255de1b6ee7e Mon Sep 17 00:00:00 2001
From: Eric Anholt <eric@anholt.net>
Date: Mon, 23 Apr 2012 17:12:04 -0700
Subject: mesa: Prevent buffer underrun when handling
 MESA_GL_EXTENSION_OVERRIDE.

---
 src/mesa/main/extensions.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'src/mesa')

diff --git a/src/mesa/main/extensions.c b/src/mesa/main/extensions.c
index 5f2c74a758e..a843a40925c 100644
--- a/src/mesa/main/extensions.c
+++ b/src/mesa/main/extensions.c
@@ -754,7 +754,7 @@ get_extension_override( struct gl_context *ctx )
 
    /* Remove trailing space. */
    len = strlen(extra_exts);
-   if (extra_exts[len - 1] == ' ')
+   if (len > 0 && extra_exts[len - 1] == ' ')
       extra_exts[len - 1] = '\0';
 
    return extra_exts;
-- 
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