From 8d48db25cc9b24c63d08fb85c6e132828b99edc6 Mon Sep 17 00:00:00 2001
From: John Maddock <john@johnmaddock.co.uk>
Date: Sat, 7 Jul 2012 12:14:09 +0000
Subject: [PATCH] Add check before copying data. Fixes #7032.

[SVN r79333]
---
 src/regex_raw_buffer.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/regex_raw_buffer.cpp b/src/regex_raw_buffer.cpp
index 84a2fd5d..f75f0a51 100644
--- a/src/regex_raw_buffer.cpp
+++ b/src/regex_raw_buffer.cpp
@@ -46,7 +46,8 @@ void BOOST_REGEX_CALL raw_storage::resize(size_type n)
    // allocate and copy data:
    register pointer ptr = static_cast<pointer>(::operator new(newsize));
    BOOST_REGEX_NOEH_ASSERT(ptr)
-   std::memcpy(ptr, start, datasize);
+   if(start)
+      std::memcpy(ptr, start, datasize);
 
    // get rid of old buffer:
    ::operator delete(start);