--- misc/libvisio-0.0.16/src/lib/VisioDocument.cpp	2012-04-13 10:54:19.000000000 +0200
+++ misc/build/libvisio-0.0.16/src/lib/VisioDocument.cpp	2012-05-16 15:16:08.974375389 +0200
@@ -45,10 +45,13 @@
 */
 bool libvisio::VisioDocument::isSupported(WPXInputStream *input)
 {
+  WPXInputStream *tmpDocStream = 0;
+  try
+  {
   input->seek(0, WPX_SEEK_SET);
   if (!input->isOLEStream())
     return false;
-  WPXInputStream *tmpDocStream = input->getDocumentOLEStream("VisioDocument");
+    tmpDocStream = input->getDocumentOLEStream("VisioDocument");
   if (!tmpDocStream)
     return false;
 
@@ -64,6 +67,13 @@
   {
     return true;
   }
+  }
+  catch (...)
+  {
+    if (tmpDocStream)
+      delete tmpDocStream;
+    return false;
+  }
 
   return false;
 }