GH-93990: fix refcounting bug in add_subclass in typeobject.c (GH…

…-93989) (GH-93999) (cherry picked from commit 726448e)
python · Jun 19, 2022 · beba102 · beba102
1 parent f21b071
commit beba102
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/Objects/typeobject.c b/Objects/typeobject.c
@@ -6400,8 +6400,11 @@ add_subclass(PyTypeObject *base, PyTypeObject *type)
     PyObject *dict = base->tp_subclasses;
     if (dict == NULL) {
         base->tp_subclasses = dict = PyDict_New();
-        if (dict == NULL)
+        if (dict == NULL) {
+            Py_DECREF(key);
+            Py_DECREF(ref);
             return -1;
+        }
     }
     assert(PyDict_CheckExact(dict));