python · markshannon · May 23, 2024 · Mar 25, 2024 · Mar 25, 2024 · Mar 25, 2024
diff --git a/Lib/test/test_long.py b/Lib/test/test_long.py
@@ -1639,6 +1639,8 @@ class MyInt(int):
                    MyInt.__basicsize__ + MyInt.__itemsize__ * ndigits
                )

+        # GH-117195 -- This shouldn't crash
+        object.__sizeof__(1)

 if __name__ == "__main__":
    unittest.main()
diff --git a/Misc/NEWS.d/next/Core and Builtins/2024-03-25-15-07-01.gh-issue-117195.OWakgD.rst b/Misc/NEWS.d/next/Core and Builtins/2024-03-25-15-07-01.gh-issue-117195.OWakgD.rst
@@ -0,0 +1,2 @@
+Avoid assertion failure for debug builds when calling
+``object.__sizeof__(1)``
@@ -7144,8 +7144,11 @@ object___sizeof___impl(PyObject *self)

    res = 0;
    isize = Py_TYPE(self)->tp_itemsize;
-    if (isize > 0)
-        res = Py_SIZE(self) * isize;
+    if (isize > 0) {
+        /* This assumes that ob_size is valid if tp_itemsize is not 0,
+         which isn't true for PyLongObject. */
+        res = _PyVarObject_CAST(self)->ob_size * isize;
+    }
    res += Py_TYPE(self)->tp_basicsize;

    return PyLong_FromSsize_t(res);
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,2 @@
		Avoid assertion failure for debug builds when calling
		``object.__sizeof__(1)``