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  1. Qt
  2. QTBUG-26824

XSD file causes QXmlSchema::load() to crash by eating memory in busy loop (showstopper)

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    Description

      The attached XSD file causes QXmlSchema::load() to hang in a busy loop consuming power of a complete CPU core and infinitely eating up memory and finally crashing.

      The XSD code is an extract of a much larger schema so it does not make much sense. Maybe there is an error in the XSD extract I can't see but in any case it may never cause the application to crash!

      <?xml version="1.0" encoding="utf-8"?>

<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">

  <xsd:element name="items">
    <xsd:complexType>
      <xsd:choice minOccurs="1" maxOccurs="255">
        <xsd:element name="Item1" type ="first" minOccurs="0" maxOccurs="255"/>
        <xsd:element name="Item2" type ="second" minOccurs="0" maxOccurs="255"/>
      </xsd:choice>
    </xsd:complexType>
  </xsd:element>
  
  <xsd:complexType name="first">
  </xsd:complexType>

  <xsd:complexType name="second">
  </xsd:complexType>

</xsd:schema>

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            Unassigned Unassigned
            silicomancer Bernhard Lindner
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