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bpo-46417: Debug tp_subclasses crash by vstinner · Pull Request #30791 · python/cpython · GitHub

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bpo-46417: Debug tp_subclasses crash #30791

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bpo-46417: Debug tp_subclasses crash #30791

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7 changes: 5 additions & 2 deletions Objects/typeobject.c
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Original file line number Diff line number Diff line change
Expand Up @@ -4138,7 +4138,7 @@ _PyType_GetSubclasses(PyTypeObject *self)
}

// Hold a strong reference to tp_subclasses while iterating on it
PyObject *dict = Py_XNewRef(self->tp_subclasses);
PyObject *dict = self->tp_subclasses;
if (dict == NULL) {
return list;
}
Expand All @@ -4159,7 +4159,6 @@ _PyType_GetSubclasses(PyTypeObject *self)
}
}
done:
Py_DECREF(dict);
return list;
}

Expand Down Expand Up @@ -6568,6 +6567,10 @@ remove_subclass(PyTypeObject *base, PyTypeObject *type)
PyErr_Clear();
}
Py_XDECREF(key);

if (PyDict_Size(dict) == 0) {
Py_CLEAR(base->tp_subclasses);
}
}

static void
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