In our code we found situation when generic error function we
provide to libxslt was called with wrong contect. Quick investigation
showed that wrong context pointer was passed. Bug appears in version 1.0.7
and cvs snapshot dated 02/28/2002  09:47:00 AM. 

This bug is pretty severe, since context is passed as void* pointer and
when casted to wrong type will most probably cause application crash when
accessed.

Here is diff file (towards said CVS snapshot) correcting this problem:

diff -u -rp XSLT.orig/libxslt/preproc.c XSLT/libxslt/preproc.c
--- XSLT.orig/libxslt/preproc.c	Thu Oct 18 00:45:09 2001
+++ XSLT/libxslt/preproc.c	Thu Feb 28 22:31:04 2002
@@ -1326,7 +1326,7 @@ xsltStylePreCompute(xsltStylesheetPtr st
 
			(xsltTransformFunction) xsltDocumentElem);
 	} else {
 	    xsltPrintErrorContext(NULL, style, inst);
-
    xsltGenericError(xsltGenericDebugContext,
+
    xsltGenericError(xsltGenericErrorContext,
 
	 "xsltStylePreCompute: unknown xsl:%s\n", inst->name);
 	    style->warnings++;
 	}