From bacb80d0d9fb9e11f6eefc0ca12648c29ca688a3 Mon Sep 17 00:00:00 2001
From: Chandler Carruth <chandlerc@gmail.com>
Date: Wed, 16 Aug 2017 07:22:49 +0000
Subject: Fix a UBSan failure where this boolean was copied when uninitialized.

When r310905 moved the pointer and bool out of a PointerIntPair, it made
them end up uninitialized and caused UBSan failures when copying the
uninitialized boolean. However, making the pointer be null should avoid
the reference to the boolean entirely.

llvm-svn: 310994
---
 clang/lib/AST/ExprConstant.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'clang')

diff --git a/clang/lib/AST/ExprConstant.cpp b/clang/lib/AST/ExprConstant.cpp
index 94b6e082d81..32cb42ea4e0 100644
--- a/clang/lib/AST/ExprConstant.cpp
+++ b/clang/lib/AST/ExprConstant.cpp
@@ -977,7 +977,7 @@ namespace {
   /// RAII object used to optionally suppress diagnostics and side-effects from
   /// a speculative evaluation.
   class SpeculativeEvaluationRAII {
-    EvalInfo *Info;
+    EvalInfo *Info = nullptr;
     Expr::EvalStatus OldStatus;
     bool OldIsSpeculativelyEvaluating;
 
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