commit 70e8f5988476c4ef3f8d0296d03a1f97380de212
author Marshall Clow <mclow.lists@gmail.com> Mon Aug 24 15:57:09 2015 +0000
committer Marshall Clow <mclow.lists@gmail.com> Mon Aug 24 15:57:09 2015 +0000
tree a3c508f148b85492972b7101ce4e8e09841edfb9
parent bb2f28e15d3666b9316bf77ced071f16fa0fc70e

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

diff --git a/include/regex b/include/regex
index b355bbb..b2b556e 100644
--- a/include/regex
+++ b/include/regex
@@ -1733,6 +1733,8 @@
 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)
     {