pythonGH-93990: fix refcounting bug in add_subclass in `typeobject.…

…c` (pythonGH-93989)
miss-islington · Jun 19, 2022 · 726448e · 726448e
1 parent 6066f45
commit 726448e
Showing 1 changed file with 4 additions and 1 deletion.
diff --git 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));