JelleZijlstra · Apr 18, 2026 · Apr 7, 2026 · Apr 7, 2026 · Apr 7, 2026 · Apr 7, 2026
diff --git a/Misc/NEWS.d/next/Core_and_Builtins/2026-04-07-20-37-23.gh-issue-148222.uF4D4E.rst b/Misc/NEWS.d/next/Core_and_Builtins/2026-04-07-20-37-23.gh-issue-148222.uF4D4E.rst
@@ -0,0 +1 @@
+Fix vectorcall support in types.GenericAlias when the underlying type does not support the vectorcall protocol. Fix possible leaks in types.GenericAlias and types.UnionType in case of memory error.
diff --git a/Objects/genericaliasobject.c b/Objects/genericaliasobject.c
@@ -242,7 +242,6 @@ _Py_make_parameters(PyObject *args)
                     len += needed;
                     if (_PyTuple_Resize(&parameters, len) < 0) {
                         Py_DECREF(subparams);
-                        Py_DECREF(parameters);
                         Py_XDECREF(tuple_args);
                         return NULL;
                     }
@@ -650,7 +649,7 @@ ga_vectorcall(PyObject *self, PyObject *const *args,
               size_t nargsf, PyObject *kwnames)
 {
     gaobject *alias = (gaobject *) self;
-    PyObject *obj = PyVectorcall_Function(alias->origin)(alias->origin, args, nargsf, kwnames);
+    PyObject *obj = PyObject_Vectorcall(alias->origin, args, nargsf, kwnames);
     return set_orig_class(obj, self);
 }
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1 @@
		Fix vectorcall support in types.GenericAlias when the underlying type does not support the vectorcall protocol. Fix possible leaks in types.GenericAlias and types.UnionType in case of memory error.
Comment thread prakashsellathurai marked this conversation as resolved. Resolved