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bpo-40170: Fix PyType_Ready() refleak on static type #23236

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Merged
merged 1 commit into from
Nov 11, 2020
Merged

bpo-40170: Fix PyType_Ready() refleak on static type #23236

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1 change: 1 addition & 0 deletions 1 Include/cpython/object.h
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Original file line number Diff line number Diff line change
Expand Up @@ -244,6 +244,7 @@ struct _typeobject {
struct PyMethodDef *tp_methods;
struct PyMemberDef *tp_members;
struct PyGetSetDef *tp_getset;
// Strong reference on a heap type, borrowed reference on a static type
struct _typeobject *tp_base;
PyObject *tp_dict;
descrgetfunc tp_descr_get;
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9 changes: 7 additions & 2 deletions 9 Objects/typeobject.c
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Expand Up @@ -5487,8 +5487,13 @@ PyType_Ready(PyTypeObject *type)
/* Initialize tp_base (defaults to BaseObject unless that's us) */
base = type->tp_base;
if (base == NULL && type != &PyBaseObject_Type) {
base = type->tp_base = &PyBaseObject_Type;
Py_INCREF(base);
base = &PyBaseObject_Type;
if (type->tp_flags & Py_TPFLAGS_HEAPTYPE) {
type->tp_base = (PyTypeObject*)Py_NewRef((PyObject*)base);
}
else {
type->tp_base = base;
}
}

/* Now the only way base can still be NULL is if type is
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