From: Ken Jin <28750310+Fidget-Spinner@users.noreply.github.com>
Date: Sat, 29 Jan 2022 14:34:12 +0000 (+0800)
Subject: fFx refleak in isinstance error path (GH-31005)
X-Git-Tag: v3.11.0a5~44
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=8fb36494501aad5b0c1d34311c9743c60bb9926c;p=thirdparty%2FPython%2Fcpython.git

fFx refleak in isinstance error path (GH-31005)
---

diff --git a/Python/ceval.c b/Python/ceval.c
index fa14a1c04f1e..b69d5aa9d320 100644
--- a/Python/ceval.c
+++ b/Python/ceval.c
@@ -4946,6 +4946,7 @@ handle_eval_breaker:
             PyObject *inst = TOP();
             int retval = PyObject_IsInstance(inst, cls);
             if (retval < 0) {
+                Py_DECREF(cls);
                 goto error;
             }
             PyObject *res = PyBool_FromLong(retval);