[xml] Runtime exception occurs on mod operations when second arg is zero

[Chris_Poblete Dell com]

VERSIONS: libxml2-2.4.3
          libxslt-1.0.3

PROBLEM:
The tag <xsl:when test="($row mod $col) = 0"> causes runtime exception
when $col happens to be zero.  It would be correct to handle this case
by exiting the program gracefully (and perhaps show error message on debug).


PROPOSED RESOLUTION:
xpath.c:xmlXPathModValues(4425)
------------------------------------------------------------
<       ctxt->value->floatval = arg1 % arg2;
----------
>       // When arg2 is zero at runtime, it will evaluate to 'divide by
zero'
>       // and will cause runtime exception.  Instead check to allow
graceful exit.
>       if (arg2 == 0)
>               ctxt->value->floatval = xmlXPathNAN;
>       else
>               ctxt->value->floatval = arg1 % arg2;
------------------------------------------------------------



_______________________________
Chris Poblete
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