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bpo-26491 Defer DECREFs until enumobject is in a consistent state (#3747)

This commit is contained in:
Raymond Hettinger 2017-09-25 02:15:53 -07:00 committed by GitHub
parent e6d9fcbb8d
commit 8110dbd470
1 changed files with 30 additions and 18 deletions
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28
Objects/enumobject.c
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@ -103,6 +103,8 @@ enum_next_long(enumobject *en, PyObject* next_item)
PyObject *result = en->en_result;
PyObject *next_index;
PyObject *stepped_up;
PyObject *old_index;
PyObject *old_item;
if (en->en_longindex == NULL) {
en->en_longindex = PyLong_FromSsize_t(PY_SSIZE_T_MAX);
@ -118,16 +120,20 @@ enum_next_long(enumobject *en, PyObject* next_item)
if (result->ob_refcnt == 1) {
Py_INCREF(result);
Py_DECREF(PyTuple_GET_ITEM(result, 0));
Py_DECREF(PyTuple_GET_ITEM(result, 1));
} else {
old_index = PyTuple_GET_ITEM(result, 0);
old_item = PyTuple_GET_ITEM(result, 1);
PyTuple_SET_ITEM(result, 0, next_index);
PyTuple_SET_ITEM(result, 1, next_item);
Py_DECREF(old_index);
Py_DECREF(old_item);
return result;
}
result = PyTuple_New(2);
if (result == NULL) {
Py_DECREF(next_index);
Py_DECREF(next_item);
return NULL;
}
}
PyTuple_SET_ITEM(result, 0, next_index);
PyTuple_SET_ITEM(result, 1, next_item);
return result;
@ -140,6 +146,8 @@ enum_next(enumobject *en)
PyObject *next_item;
PyObject *result = en->en_result;
PyObject *it = en->en_sit;
PyObject *old_index;
PyObject *old_item;
next_item = (*Py_TYPE(it)->tp_iternext)(it);
if (next_item == NULL)
@ -157,16 +165,20 @@ enum_next(enumobject *en)
if (result->ob_refcnt == 1) {
Py_INCREF(result);
Py_DECREF(PyTuple_GET_ITEM(result, 0));
Py_DECREF(PyTuple_GET_ITEM(result, 1));
} else {
old_index = PyTuple_GET_ITEM(result, 0);
old_item = PyTuple_GET_ITEM(result, 1);
PyTuple_SET_ITEM(result, 0, next_index);
PyTuple_SET_ITEM(result, 1, next_item);
Py_DECREF(old_index);
Py_DECREF(old_item);
return result;
}
result = PyTuple_New(2);
if (result == NULL) {
Py_DECREF(next_index);
Py_DECREF(next_item);
return NULL;
}
}
PyTuple_SET_ITEM(result, 0, next_index);
PyTuple_SET_ITEM(result, 1, next_item);
return result;