From b08ed4f5955ef72309b6e20d865faf6d925c8c6e Mon Sep 17 00:00:00 2001
From: Eric Anholt <eric@anholt.net>
Date: Tue, 22 Dec 2009 12:38:11 -0800
Subject: [PATCH] mesa: Fix a NULL deref in glDeleteFragmentShaderATI(badname);

Fixes piglit ati-fs-bad-delete.  Caught by clang.
---
 src/mesa/shader/atifragshader.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/mesa/shader/atifragshader.c b/src/mesa/shader/atifragshader.c
index ac087d415c5..e04a05b22ff 100644
--- a/src/mesa/shader/atifragshader.c
+++ b/src/mesa/shader/atifragshader.c
@@ -290,9 +290,11 @@ _mesa_DeleteFragmentShaderATI(GLuint id)
 
       /* The ID is immediately available for re-use now */
       _mesa_HashRemove(ctx->Shared->ATIShaders, id);
-      prog->RefCount--;
-      if (prog->RefCount <= 0) {
-         _mesa_free(prog);
+      if (prog) {
+	 prog->RefCount--;
+	 if (prog->RefCount <= 0) {
+	    _mesa_free(prog);
+	 }
       }
    }
 }
-- 
2.30.2