[Mesa-dev] [PATCH 4/5] mesa: Prevent buffer underrun when handling MESA_GL_EXTENSION_OVERRIDE.

[Eric Anholt]

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

diff --git a/src/mesa/main/extensions.c b/src/mesa/main/extensions.c
index 5f2c74a..a843a40 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;
-- 
1.7.10