From 371c217b3f47c8e06dfbc7a86882e60d5059bba9 Mon Sep 17 00:00:00 2001
From: Dmitri Gribenko <gribozavr@gmail.com>
Date: Wed, 12 Feb 2014 14:17:58 +0000
Subject: [PATCH] libclang: fix a crash in clang_disposeDiagnosticSet when it
 is passed a NULL argument

llvm-svn: 201236
---
 clang/tools/libclang/CIndexDiagnostic.cpp | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/clang/tools/libclang/CIndexDiagnostic.cpp b/clang/tools/libclang/CIndexDiagnostic.cpp
index 0c327f611a2b..d3450d5dece7 100644
--- a/clang/tools/libclang/CIndexDiagnostic.cpp
+++ b/clang/tools/libclang/CIndexDiagnostic.cpp
@@ -450,9 +450,10 @@ CXString clang_getDiagnosticFixIt(CXDiagnostic Diag, unsigned FixIt,
 }
 
 void clang_disposeDiagnosticSet(CXDiagnosticSet Diags) {
-  CXDiagnosticSetImpl *D = static_cast<CXDiagnosticSetImpl*>(Diags);
-  if (D->isExternallyManaged())
-    delete D;
+  if (CXDiagnosticSetImpl *D = static_cast<CXDiagnosticSetImpl *>(Diags)) {
+    if (D->isExternallyManaged())
+      delete D;
+  }
 }
   
 CXDiagnostic clang_getDiagnosticInSet(CXDiagnosticSet Diags,