[xml] xpath/xslt memory leak

[Paweł Pałucha <pawel praterm com pl>]

Hi,
I think I've found a nice memory leak. I'm using xslt to reproduce it, but I 
think that bug is in xpath module, so I send it here.

The program is just transforming simple document in loop:

#include <libxml/parser.h>
#include <libxslt/xslt.h>
#include <libxslt/transform.h>


int main(int argc, char **argv) {
        xsltStylesheetPtr cur;
        xmlDocPtr doc, res;


        xmlInitParser();
        xmlSubstituteEntitiesDefault(1);
        xmlLoadExtDtdDefaultValue = 1;


        cur = xsltParseStylesheetFile("b.xsl");
        while (1) {
                doc = xmlParseFile("b.xml");
                res = xsltApplyStylesheet(cur, doc, NULL);
                xmlFreeDoc(res);
                xmlFreeDoc(doc);
        }
        return(0);
}

Document (b.xml) is like that:
<?xml version="1.0"?>
<params xmlns="http://www.praterm.com.pl/SZARP/ipk";>
    <param>
        <raport title="A"/>
    </param>
</params>

and stylesheet:

<?xml version="1.0"?>

                              <xsl:stylesheet version="1.0"
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
  xmlns:ipk="http://www.praterm.com.pl/SZARP/ipk";>

                            <!-- <xsl:param name="title"/> -->
  <xsl:template match="ipk:params">
    <xsl:element name="report">
      <xsl:for-each select="//ipk:param[ipk:raport[ title=$title]]">
        <xsl:element name="param">
        </xsl:element>
      </xsl:for-each>
    </xsl:element>
  </xsl:template>
</xsl:stylesheet>

The stylesheet is somewhat incorrect - declaration of parameter 'title' is 
missing. This simple program keeps allocating more and more memory (can be 
viewed with top/htop). When I uncomment the parameter declaration, everything 
works OK.
And, btw - the output from valgrind differs when I use '--leak-resolution=high'.
Checked with 2.6.18, but there's nothing about it in changelog, so I suppose 
its still there.
Files in attachment for convenience.

Paweł Pałucha

Attachment: xpath-memleak.tgz
Description: GNU Unix tar archive