From 232eaaf3b6e46cf80d992e68b6db8313eff3b694 Mon Sep 17 00:00:00 2001
From: Alexey Samsonov <vonosmas@gmail.com>
Date: Thu, 28 Aug 2014 22:18:42 +0000
Subject: [PATCH] Don't create a null reference to NestedNameSpecifier.

This bug was reported by UBSan.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@216691 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/ASTMatchers/ASTMatchFinder.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/ASTMatchers/ASTMatchFinder.cpp b/lib/ASTMatchers/ASTMatchFinder.cpp
index 050630fd4b..6c5bc3c372 100644
--- a/lib/ASTMatchers/ASTMatchFinder.cpp
+++ b/lib/ASTMatchers/ASTMatchFinder.cpp
@@ -731,7 +731,8 @@ bool MatchASTVisitor::TraverseNestedNameSpecifierLoc(
   match(NNS);
   // We only match the nested name specifier here (as opposed to traversing it)
   // because the traversal is already done in the parallel "Loc"-hierarchy.
-  match(*NNS.getNestedNameSpecifier());
+  if (NNS.hasQualifier())
+    match(*NNS.getNestedNameSpecifier());
   return
       RecursiveASTVisitor<MatchASTVisitor>::TraverseNestedNameSpecifierLoc(NNS);
 }
-- 
2.40.0