[xslt] Infinite recursion via func:function seg faults

[Mark Howe <mvah cyberporte com>]

Hi,

Here's the stylesheet:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>

<xsl:stylesheet
    version="1.0"
    xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
    xmlns:func="http://exslt.org/functions";
    xmlns:abc="abc"
    extension-element-prefixes="func abc">

  <xsl:template match="/">
    <test>
      <xsl:value-of select="abc:bad_test()"/>
      <!-- <xsl:call-template name="abc:bad_test"/> -->
    </test>
  </xsl:template>

  <func:function name="abc:bad_test">
    <xsl:param name="length"/>
    <func:result>
      <xsl:value-of select="abc:bad_test()"/>
    </func:result>
  </func:function>

  <xsl:template name="abc:bad_test">
    <xsl:param name="length"/>
    <xsl:call-template name="abc:bad_test"/>
  </xsl:template>

</xsl:stylesheet>

If I call it against itself using xsltproc I get a seg fault. If I
comment out

<xsl:value-of select="abc:bad_test()"/>

and uncomment

<xsl:call-template name="abc:bad_test"/>

I get

runtime error: file xteriorize/xcathedra/bad_test.xsl line 25 element
param xsltApplyXSLTTemplate: A potential infinite template recursion was
detected.

etc. I deduce from this that there is no deep recursion test (or indeed
stack overflow) checking on func:function-type recursion.

Obviously the error is in my application code, but it would be extremely
helpful if LibXSLT could say something more informative than
'segmentation fault' in response.

Regards,

Mark