From 06f0e097568b647a31338861f3a8adcbb021c4d4 Mon Sep 17 00:00:00 2001
From: John McCall <rjmccall@apple.com>
Date: Fri, 7 May 2010 21:01:17 +0000
Subject: [PATCH] Fix a potential null dereference in the pointer-to-bool
 evaluator;  caught by Eli Friedman.

llvm-svn: 103297
---
 clang/lib/AST/ExprConstant.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/clang/lib/AST/ExprConstant.cpp b/clang/lib/AST/ExprConstant.cpp
index b6613e7cdc36..c534d03a5ed8 100644
--- a/clang/lib/AST/ExprConstant.cpp
+++ b/clang/lib/AST/ExprConstant.cpp
@@ -115,7 +115,7 @@ static bool EvalPointerValueAsBool(LValue& Value, bool& Result) {
 
   Result = Base || !Value.Offset.isZero();
 
-  const DeclRefExpr* DeclRef = dyn_cast<DeclRefExpr>(Base);
+  const DeclRefExpr* DeclRef = dyn_cast_or_null<DeclRefExpr>(Base);
   if (!DeclRef)
     return true;