Issue #23783: Fixed memory leak in PyObject_ClearWeakRefs() in case of

MemoryError.

Objects/weakrefobject.c

@@ -900,10 +900,8 @@ PyObject_ClearWeakRefs(PyObject *object)
     if (*list != NULL) {
         PyWeakReference *current = *list;
         Py_ssize_t count = _PyWeakref_GetWeakrefCount(current);
-        int restore_error = PyErr_Occurred() ? 1 : 0;
         PyObject *err_type, *err_value, *err_tb;
 
-        if (restore_error)
         PyErr_Fetch(&err_type, &err_value, &err_tb);
         if (count == 1) {
             PyObject *callback = current->wr_callback;
@@ -922,8 +920,7 @@ PyObject_ClearWeakRefs(PyObject *object)
 
             tuple = PyTuple_New(count * 2);
             if (tuple == NULL) {
-                if (restore_error)
-                    PyErr_Fetch(&err_type, &err_value, &err_tb);
+                _PyErr_ChainExceptions(err_type, err_value, err_tb);
                 return;
             }
 
@@ -954,7 +951,7 @@ PyObject_ClearWeakRefs(PyObject *object)
             }
             Py_DECREF(tuple);
         }
-        if (restore_error)
+        assert(!PyErr_Occurred());
         PyErr_Restore(err_type, err_value, err_tb);
     }
 }