From: Benedikt Johannes <benedikt.johannes.hofer@gmail.com>
Date: Tue, 10 Mar 2026 16:33:56 +0000 (+0100)
Subject: gh-145044: avoid calling `Py_DECREF` in `unsafe_object_compare` on immortal objects... 
X-Git-Tag: v3.15.0a8~371
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=50f82d062b3b59a09d6b63648df22d46f7f2b010;p=thirdparty%2FPython%2Fcpython.git

gh-145044: avoid calling `Py_DECREF` in `unsafe_object_compare` on immortal objects (#145045)
---

diff --git a/Objects/listobject.c b/Objects/listobject.c
index 62d04ab150a7..1fcedd3a28c9 100644
--- a/Objects/listobject.c
+++ b/Objects/listobject.c
@@ -2795,11 +2795,12 @@ unsafe_object_compare(PyObject *v, PyObject *w, MergeState *ms)
 
     if (PyBool_Check(res_obj)) {
         res = (res_obj == Py_True);
+        assert(_Py_IsImmortal(res_obj));
     }
     else {
         res = PyObject_IsTrue(res_obj);
+        Py_DECREF(res_obj);
     }
-    Py_DECREF(res_obj);
 
     /* Note that we can't assert
      *     res == PyObject_RichCompareBool(v, w, Py_LT);