https://github.com/python/cpython/commit/726448ebe15cd78e180c29c9858cb6c10a581524 commit: 726448ebe15cd78e180c29c9858cb6c10a581524 branch: main author: Kumar Aditya <59607654+kumaraditya303 at users.noreply.github.com> committer: Fidget-Spinner <kenjin at python.org> date: 2022年06月19日T14:06:37+08:00 summary: GH-93990: fix refcounting bug in `add_subclass` in `typeobject.c` (GH-93989) files: M Objects/typeobject.c diff --git a/Objects/typeobject.c b/Objects/typeobject.c index 513055168062f..1236acdcd1930 100644 --- a/Objects/typeobject.c +++ b/Objects/typeobject.c @@ -6671,8 +6671,11 @@ add_subclass(PyTypeObject *base, PyTypeObject *type) PyObject *subclasses = base->tp_subclasses; if (subclasses == NULL) { base->tp_subclasses = subclasses = PyDict_New(); - if (subclasses == NULL) + if (subclasses == NULL) { + Py_DECREF(key); + Py_DECREF(ref); return -1; + } } assert(PyDict_CheckExact(subclasses));