boost/boost-1.64.0-regex-overflow.patch

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From bc9b25b5d3c3784543158510c6087d41739ab64a Mon Sep 17 00:00:00 2001
From: jzmaddock <john@johnmaddock.co.uk>
Date: Mon, 31 Jul 2017 19:18:10 +0100
Subject: [PATCH] Fix potential overflow in max_state_count calculation. Fixes:
https://svn.boost.org/trac10/ticket/13036.
---
include/boost/regex/v4/perl_matcher_common.hpp | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/include/boost/regex/v4/perl_matcher_common.hpp b/include/boost/regex/v4/perl_matcher_common.hpp
index 7974e7483..f08e9d434 100644
--- a/include/boost/regex/v4/perl_matcher_common.hpp
+++ b/include/boost/regex/v4/perl_matcher_common.hpp
@@ -113,6 +113,11 @@ void perl_matcher<BidiIterator, Allocator, traits>::estimate_max_state_count(std
std::ptrdiff_t states = re.size();
if(states == 0)
states = 1;
+ if ((std::numeric_limits<std::ptrdiff_t>::max)() / states < states)
+ {
+ max_state_count = (std::min)((std::ptrdiff_t)BOOST_REGEX_MAX_STATE_COUNT, (std::numeric_limits<std::ptrdiff_t>::max)() - 2);
+ return;
+ }
states *= states;
if((std::numeric_limits<std::ptrdiff_t>::max)() / dist < states)
{