50 % cpu usage and system memory exhaustion after calling QDomDocument::cloneNode( true ) if xml file contains entities in DOCTYPE section

Let say we have a xml file named 'first.xml' with content as follows:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE first [
<!ENTITY secondFile SYSTEM "second.xml">
]>

<first>
<child>
</child>
</first>

and we have a application code (main.cpp) as follows:

#include <QApplication>
#include <iostream>
#include <QtXml>

using namespace std;

int main( int argc, char** argv )
{
QApplication app( argc, argv );

QDomDocument iDomDocument;
QFile iFile( first.xml );
if ( false == iFile.open( QIODevice::ReadOnly ) )

{ cout << "Could not open file " << iFirstFileName.toStdString() << " error: " << iFile.error() << endl; return 1; }

QString iErrorMessage = "";
int iErrorLine;
int iErrorColumn;
if ( false == iDomDocument.setContent( &iFile, &iErrorMessage, &iErrorLine, &iErrorColumn ) )

{ cout << "Could not set content " << iErrorMessage.toStdString() << ", line: " << iErrorLine << ", column: " << iErrorColumn << endl; iFile.close(); return 2; }

QDomDocument iDoc2 = iDomDocument.cloneNode( true ).toDocument();

cout << "We are cool!" << endl;
return 0;
}

after calling iDomDocument.cloneNode( true ).toDocument();
my cpu usage goes to 50% (dual core processor) and memory usage started growing rapidly.

Hope you will able to reproduce this.

Regards
Grzegorz Wolszczak