From c636432b03fd429e3fc3209be2fe8065c0b89f9a Mon Sep 17 00:00:00 2001
From: Kumar Aditya <59607654+kumaraditya303@users.noreply.github.com>
Date: Sun, 19 Jun 2022 11:36:37 +0530
Subject: [PATCH] GH-93990: fix refcounting bug in `add_subclass` in
 `typeobject.c` (GH-93989)

---
 Objects/typeobject.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Objects/typeobject.c b/Objects/typeobject.c
index 50f2742f676f68..65a9475ab7d7fe 100644
--- 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));