From e1698550ad263f133f8b72ba8105584ce041a1c1 Mon Sep 17 00:00:00 2001
From: Mehdi Amini <mehdi.amini@apple.com>
Date: Fri, 27 Jan 2017 20:32:16 +0000
Subject: [PATCH] Fix ASAN failure in cxa_demangle

Found with ASAN + libFuzzer by Kostya Serebryany <kcc@google.com>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@293330 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Demangle/ItaniumDemangle.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/Demangle/ItaniumDemangle.cpp b/lib/Demangle/ItaniumDemangle.cpp
index 59f6c2d3612..5a0352c5390 100644
--- a/lib/Demangle/ItaniumDemangle.cpp
+++ b/lib/Demangle/ItaniumDemangle.cpp
@@ -1402,7 +1402,8 @@ static const char *parse_function_type(const char *first, const char *last,
         int ref_qual = 0;
         while (true) {
           if (t == last) {
-            db.names.pop_back();
+            if (!db.names.empty())
+              db.names.pop_back();
             return first;
           }
           if (*t == 'E') {
-- 
2.40.0