From be6016a97200d651198a187d1321f16475b907fa Mon Sep 17 00:00:00 2001
From: Dave Abrahams <dave@boostpro.com>
Date: Sun, 10 Mar 2002 06:38:50 +0000
Subject: [PATCH] Prevent dangling reference returns

[SVN r13163]
---
 src/converter/callback.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/converter/callback.cpp b/src/converter/callback.cpp
index 68ea32f1..0ff0c29a 100644
--- a/src/converter/callback.cpp
+++ b/src/converter/callback.cpp
@@ -66,6 +66,13 @@ namespace detail
       , lvalue_from_python_registration*const& converters)
   {
       ref holder(source);
+      if (source->ob_refcnt <= 2)
+      {
+          PyErr_SetString(
+              PyExc_ReferenceError
+              , const_cast<char*>("Attempt to return dangling internal reference"));
+          throw error_already_set();
+      }
       void* result = find(source, converters);
       if (!result)
       {