From 70e8f5988476c4ef3f8d0296d03a1f97380de212 Mon Sep 17 00:00:00 2001
From: Marshall Clow <mclow.lists@gmail.com>
Date: Mon, 24 Aug 2015 15:57:09 +0000
Subject: Fix a crasher found by libFuzzer

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@245849 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/regex | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'include/regex')

diff --git a/include/regex b/include/regex
index b355bbb3a..b2b556e5b 100644
--- a/include/regex
+++ b/include/regex
@@ -1733,6 +1733,8 @@ template <class _CharT>
 void
 __back_ref<_CharT>::__exec(__state& __s) const
 {
+    if (__mexp_ > __s.__sub_matches_.size())
+        __throw_regex_error<regex_constants::error_backref>();
     sub_match<const _CharT*>& __sm = __s.__sub_matches_[__mexp_-1];
     if (__sm.matched)
     {
-- 
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