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Issue #24103: Fixed possible use after free in ElementTree.XMLPullParser.

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This commit is contained in:
Serhiy Storchaka 2015-12-24 11:51:57 +02:00
parent 5a57ade58e
commit bc4ded9537
2 changed files with 15 additions and 19 deletions
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2
Misc/NEWS
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@ -31,6 +31,8 @@ Core and Builtins
Library
-------
- Issue #24103: Fixed possible use after free in ElementTree.XMLPullParser.
- Issue #25860: os.fwalk() no longer skips remaining directories when error
occurs. Original patch by Samson Lee.

32
Modules/_elementtree.c
View File

@ -3598,7 +3598,7 @@ _elementtree_XMLParser__setevents_impl(XMLParserObject *self,
/*[clinic end generated code: output=1440092922b13ed1 input=59db9742910c6174]*/
{
/* activate element event reporting */
Py_ssize_t i, seqlen;
Py_ssize_t i;
TreeBuilderObject *target;
PyObject *events_seq;
@ -3614,8 +3614,7 @@ _elementtree_XMLParser__setevents_impl(XMLParserObject *self,
target = (TreeBuilderObject*) self->target;
Py_INCREF(events_queue);
Py_XDECREF(target->events);
target->events = events_queue;
Py_SETREF(target->events, events_queue);
/* clear out existing events */
Py_CLEAR(target->start_event_obj);
@ -3634,46 +3633,41 @@ _elementtree_XMLParser__setevents_impl(XMLParserObject *self,
return NULL;
}
seqlen = PySequence_Size(events_seq);
for (i = 0; i < seqlen; ++i) {
for (i = 0; i < PySequence_Size(events_seq); ++i) {
PyObject *event_name_obj = PySequence_Fast_GET_ITEM(events_seq, i);
char *event_name = NULL;
if (PyUnicode_Check(event_name_obj)) {
event_name = _PyUnicode_AsString(event_name_obj);
event_name = PyUnicode_AsUTF8(event_name_obj);
} else if (PyBytes_Check(event_name_obj)) {
event_name = PyBytes_AS_STRING(event_name_obj);
}
if (event_name == NULL) {
Py_DECREF(events_seq);
PyErr_Format(PyExc_ValueError, "invalid events sequence");
return NULL;
} else if (strcmp(event_name, "start") == 0) {
Py_INCREF(event_name_obj);
target->start_event_obj = event_name_obj;
}
Py_INCREF(event_name_obj);
if (strcmp(event_name, "start") == 0) {
Py_SETREF(target->start_event_obj, event_name_obj);
} else if (strcmp(event_name, "end") == 0) {
Py_INCREF(event_name_obj);
Py_XDECREF(target->end_event_obj);
target->end_event_obj = event_name_obj;
Py_SETREF(target->end_event_obj, event_name_obj);
} else if (strcmp(event_name, "start-ns") == 0) {
Py_INCREF(event_name_obj);
Py_XDECREF(target->start_ns_event_obj);
target->start_ns_event_obj = event_name_obj;
Py_SETREF(target->start_ns_event_obj, event_name_obj);
EXPAT(SetNamespaceDeclHandler)(
self->parser,
(XML_StartNamespaceDeclHandler) expat_start_ns_handler,
(XML_EndNamespaceDeclHandler) expat_end_ns_handler
);
} else if (strcmp(event_name, "end-ns") == 0) {
Py_INCREF(event_name_obj);
Py_XDECREF(target->end_ns_event_obj);
target->end_ns_event_obj = event_name_obj;
Py_SETREF(target->end_ns_event_obj, event_name_obj);
EXPAT(SetNamespaceDeclHandler)(
self->parser,
(XML_StartNamespaceDeclHandler) expat_start_ns_handler,
(XML_EndNamespaceDeclHandler) expat_end_ns_handler
);
} else {
Py_DECREF(event_name_obj);
Py_DECREF(events_seq);
PyErr_Format(PyExc_ValueError, "unknown event '%s'", event_name);
return NULL;