From 50f82c94b9bf1ff982f9ddd8b9a88fb91d9e0bec Mon Sep 17 00:00:00 2001
From: Dimitri van Heesch <dimitri@stack.nl>
Date: Fri, 9 Jan 2015 19:28:36 +0100
Subject: Fixed potential crash while generating dot graphs

---
 src/dot.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/dot.cpp b/src/dot.cpp
index 036cc86..f6dc576 100644
--- a/src/dot.cpp
+++ b/src/dot.cpp
@@ -810,7 +810,11 @@ void DotRunner::addPostProcessing(const char *cmd,const char *args)
 bool DotRunner::run()
 {
   int exitCode=0;
-  QCString dotExe   = Config_getString("DOT_PATH")+"dot";
+  // we need to use data here to make a copy of the string, as Config_getString can be called by
+  // multiple threads simulaneously and the reference counting is not thread safe.
+  QCString dotExe   = Config_getString("DOT_PATH").data();
+  dotExe+="dot";
+
   bool multiTargets = Config_getBool("DOT_MULTI_TARGETS");
   QCString dotArgs;
   QListIterator<QCString> li(m_jobs);
-- 
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