From 803317aab622e4f12e7d342be5bbb4f16b088efd Mon Sep 17 00:00:00 2001
From: Stephen Kelly <steveire@gmail.com>
Date: Tue, 27 Jan 2015 23:50:42 +0100
Subject: cmSystemTools: Early return if size makes later comparison false.

---
 Source/cmSystemTools.cxx | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Source/cmSystemTools.cxx b/Source/cmSystemTools.cxx
index b07dd78..bb007ef 100644
--- a/Source/cmSystemTools.cxx
+++ b/Source/cmSystemTools.cxx
@@ -366,6 +366,10 @@ bool cmSystemTools::IsInternallyOn(const char* val)
     return false;
     }
   std::basic_string<char> v = val;
+  if (v.size() > 4)
+    {
+    return false;
+    }
 
   for(std::basic_string<char>::iterator c = v.begin();
       c != v.end(); c++)
-- 
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