Google

Edit File: xpathleak.py

#!/usr/bin/python
import sys, libxml2

libxml2.debugMemory(True)

expect="""--> Invalid expression
--> xmlXPathEval: evaluation failed
--> Invalid expression
--> xmlXPathEval: evaluation failed
--> Invalid expression
--> xmlXPathEval: evaluation failed
--> Invalid expression
--> xmlXPathEval: evaluation failed
--> Invalid expression
--> xmlXPathEval: evaluation failed
--> Invalid expression
--> xmlXPathEval: evaluation failed
--> Invalid expression
--> xmlXPathEval: evaluation failed
--> Invalid expression
--> xmlXPathEval: evaluation failed
--> Invalid expression
--> xmlXPathEval: evaluation failed
--> Invalid expression
--> xmlXPathEval: evaluation failed
"""
err=""
def callback(ctx, str):
     global err

err = err + "%s %s" % (ctx, str)

libxml2.registerErrorHandler(callback, "-->")

doc = libxml2.parseDoc("<fish/>")
ctxt = doc.xpathNewContext()
ctxt.setContextNode(doc)
badexprs = (
	":false()", "bad:()", "bad(:)", ":bad(:)", "bad:(:)", "bad:bad(:)",
	"a:/b", "/c:/d", "//e:/f", "g://h"
	)
for expr in badexprs:
	try:
		ctxt.xpathEval(expr)
	except libxml2.xpathError:
	        pass
	else:
		print("Unexpectedly legal expression:", expr)
ctxt.xpathFreeContext()
doc.freeDoc()

if err != expect:
    print("error")
    print("received %s" %(err))
    print("expected %s" %(expect))
    sys.exit(1)

libxml2.cleanupParser()
leakedbytes = libxml2.debugMemory(True)
if leakedbytes == 0:
	print("OK")
else:
	print("Memory leak", leakedbytes, "bytes")
	# drop file to .memdump file in cwd, but won't work if not compiled in
	libxml2.dumpMemory()