From: Eric Anholt <eric@anholt.net>
Date: Tue, 24 Apr 2012 00:12:04 +0000 (-0700)
Subject: mesa: Prevent buffer underrun when handling MESA_GL_EXTENSION_OVERRIDE.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=3362c7d9b61462855f1e7d67da5d255de1b6ee7e;p=mesa.git

mesa: Prevent buffer underrun when handling MESA_GL_EXTENSION_OVERRIDE.
---

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;