From b95735596ba7889ed4f972c50fce1cbd688c93d4 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) (cherry picked from commit
726448ebe15cd78e180c29c9858cb6c10a581524)
Co-authored-by: Kumar Aditya <59607654+kumaraditya303@users.noreply.github.com>
---
Objects/typeobject.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/Objects/typeobject.c b/Objects/typeobject.c
index c1bae0b9a6d62f..d95b850699ed8e 100644
--- a/Objects/typeobject.c
+++ b/Objects/typeobject.c
@@ -6512,8 +6512,11 @@ 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));
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