Transformation can get stuck in an infinite loop
------------------------------------------------
Key: XALANC-720
URL: https://issues.apache.org/jira/browse/XALANC-720
Project: XalanC
Issue Type: Bug
Components: XalanC
Affects Versions: 1.10
Environment: Linux x86 (both 32 and 64-bit) - seen on RHEL 6, Unbuntu
and SLES
Reporter: Scott Exton
Assignee: Brian Minchau
The XalanTransformer::transform function will get stuck in an infinite loop for
certain stylesheets. This problem occurs if you execute the following command
(using the sample programs):
XalanTransform test.xml test.xsl test.out, with the following file contents:
-- test-xml
<?xml version="1.0"
encoding='UTF-8'?><HTTPResponse><ResponseLine><Version>HTTP/1.1</Version><StatusCode>401</StatusCode><Reason>Unauthorized</Reason></ResponseLine><Headers><Header
name="content-length">1244</Header><Header
name="content-type">text%2Fhtml</Header><Header
name="date">Thu,%2010%20Nov%202011%2004%3A21%3A08%20GMT</Header><Header
name="cache-control">no-cache</Header><Header
name="pragma">no-cache</Header></Headers><Cookies></Cookies></HTTPResponse>
-- test.xsl
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
version="1.0">
<xsl:strip-space elements="*" />
<xsl:output method="xml" omit-xml-declaration="no" encoding="UTF-8"
indent="yes" />
<!-- Initially we start with a copy of the document. -->
<xsl:template match="@* | node()">
<xsl:copy>
<xsl:apply-templates select="@* | node()" />
</xsl:copy>
</xsl:template>
<!-- Add a new header if it doesn't exist -->
<xsl:template match="//HTTPResponse/Headers/Header">
<xsl:choose>
<xsl:when test="@name='cache-control'">
<Header Name="hdr-2">val-2</Header>
</xsl:when>
<xsl:otherwise>
</xsl:otherwise>
</xsl:choose>
<xsl:apply-templates select="//HTTPResponse/Headers/Header"/>
</xsl:template>
</xsl:stylesheet>
--
In this instance the XalanTransform binary will never complete. The problem
stems from the '<xsl:apply-templates select="//HTTPResponse/Headers/Header"/>'
line. If this line is removed from the XSLT everything works correctly. So,
the XSLT is probably malformed, but the program still shouldn't get stuck in an
infinite loop.
Unfortunately I don't know the xalan-c code at all, but I have managed to work
out that we get stuck in the ElemTemplateElement::execute() function. The
following condition,
currentElement->getInvoker(executionContext) == invoker, is never met, which
means that we never break out of the loop.
Any help would be appreciated.
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