gh-154275: Fix cleanup code in `_Py_make_parameters` (#154341)

diff --git a/Objects/genericaliasobject.c b/Objects/genericaliasobject.c
index 5caf5c7086c87a0ce4b767521a2a1b61d6585b86..71d946a637df1c913f857c4ac0c307c0b4fad5e1 100644 (file)
--- a/Objects/genericaliasobject.c
+++ b/Objects/genericaliasobject.c
@@ -195,15 +195,14 @@ _Py_make_parameters(PyObject *args)
     if (is_args_list) {
         args = tuple_args = PySequence_Tuple(args);
         if (args == NULL) {
-            return NULL;
+            goto cleanup;
         }
     }
     Py_ssize_t nargs = PyTuple_GET_SIZE(args);
     Py_ssize_t len = nargs;
     PyObject *parameters = PyTuple_New(len);
     if (parameters == NULL) {
-        Py_XDECREF(tuple_args);
-        return NULL;
+        goto error;
     }
     Py_ssize_t iparam = 0;
     for (Py_ssize_t iarg = 0; iarg < nargs; iarg++) {