XML Schema: XPath parser gets stuck in infinite loop for some valid XPath
expressions
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Key: XERCESJ-1280
URL: https://issues.apache.org/jira/browse/XERCESJ-1280
Project: Xerces2-J
Issue Type: Bug
Components: XML Schema Structures
Affects Versions: 2.9.1
Reporter: Michael Glavassevich
Xerces' schema loader hangs in the XPath parser while attempting to process the
following invalid schema:
<?xml version="1.0" encoding="UTF-8"?>
<schema xmlns="http://www.w3.org/2001/XMLSchema";>
<complexType name="NewComplexType">
<sequence>
<element name="NewElement" type="string">
<key name="abc">
<selector xpath="\"></selector>
</key>
</element>
</sequence>
</complexType>
</schema>
There's a large case block in the XPath scanner which is missing a "default:"
which causes it to loop forever on the same character in the invalid expression
without ever progressing to the next character in the string (or breaking out
of the loop if it's at the end of the string).
See https://bugs.eclipse.org/bugs/show_bug.cgi?id=209733 where this bug was
first reported.
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