Memory leak when using handlers in multiple phases at same time.
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Key: MODPYTHON-181
URL: http://issues.apache.org/jira/browse/MODPYTHON-181
Project: mod_python
Issue Type: Bug
Components: core
Affects Versions: 3.2.8, 3.1.4, 3.3
Reporter: Graham Dumpleton
Assigned To: Graham Dumpleton
When using handlers against multiple phases, ie.,
# .htaccess
PythonFixupHandler handlers
AddHandler mod_python .py
PythonHandler handlers
# handlers.py
from mod_python import apache
def handler(req):
req.content_type = 'text/plain'
req.write('handler')
return apache.OK
def fixuphandler(req):
return apache.OK
mod_python will leak memory on each request, which Apache child process sizes
blowing out quite quickly.
The problem code is in python_handler() in 'src/mod_python.c'. Specifically the
code does:
if (!hle) {
/* create a handler list object from dynamically registered handlers */
request_obj->hlo = (hlistobject *)MpHList_FromHLEntry(dynhle, 1);
}
else {
/* create a handler list object */
request_obj->hlo = (hlistobject *)MpHList_FromHLEntry(hle, 1);
/* add dynamically registered handlers, if any */
if (dynhle) {
MpHList_Append(request_obj->hlo, dynhle);
}
}
Problem is that request_obj->hlo can already be set by a prior phase's handler
and by simply assigning to request_obj->hlo you get a memory leak as it refers
to an existing Python object and it isn't being decref'd.
Thus, before this 'if' statement, it would appear that the following should
be inserted.
if (request_obj->hlo)
Py_DECREF(request_obj->hlo);
or:
Py_XDECREF(request_obj->hlo);
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