From da520dcbeb84fef1acbcc2ba8b48a315dedf5464 Mon Sep 17 00:00:00 2001
From: Marshall Clow <mclow.lists@gmail.com>
Date: Sat, 24 Dec 2016 17:21:03 +0000
Subject: Fix bug #31387 - not checking end iterator when parsing decimal
 escape. Thanks to Karen for the report.

llvm-svn: 290500
---
 libcxx/include/regex | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'libcxx/include/regex')

diff --git a/libcxx/include/regex b/libcxx/include/regex
index 1c4cc1d9abb..5a6c7fbb8e0 100644
--- a/libcxx/include/regex
+++ b/libcxx/include/regex
@@ -4314,7 +4314,8 @@ basic_regex<_CharT, _Traits>::__parse_decimal_escape(_ForwardIterator __first,
         else if ('1' <= *__first && *__first <= '9')
         {
             unsigned __v = *__first - '0';
-            for (++__first; '0' <= *__first && *__first <= '9'; ++__first)
+            for (++__first;
+                    __first != __last && '0' <= *__first && *__first <= '9'; ++__first)
                 __v = 10 * __v + *__first - '0';
             if (__v > mark_count())
                 __throw_regex_error<regex_constants::error_backref>();
-- 
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