From 685da0264cf45e9c4e68fd481e26dc4c3da86534 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?B=C3=A9n=C3=A9dikt=20Tran?=
 <10796600+picnixz@users.noreply.github.com>
Date: Thu, 20 Mar 2025 17:49:51 +0100
Subject: [PATCH] fix UBSan failures for `bytesobject.c`

---
 Objects/bytesobject.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/Objects/bytesobject.c b/Objects/bytesobject.c
index 1615571035853c..5d736414dd2f6c 100644
--- a/Objects/bytesobject.c
+++ b/Objects/bytesobject.c
@@ -2648,15 +2648,16 @@ bytes_hex_impl(PyBytesObject *self, PyObject *sep, int bytes_per_sep)
 }
 
 static PyObject *
-bytes_getnewargs(PyBytesObject *v, PyObject *Py_UNUSED(ignored))
+bytes_getnewargs(PyObject *op, PyObject *Py_UNUSED(dummy))
 {
+    PyBytesObject *v = _PyBytes_CAST(op);
     return Py_BuildValue("(y#)", v->ob_sval, Py_SIZE(v));
 }
 
 
 static PyMethodDef
 bytes_methods[] = {
-    {"__getnewargs__",          (PyCFunction)bytes_getnewargs,  METH_NOARGS},
+    {"__getnewargs__", bytes_getnewargs,  METH_NOARGS},
     BYTES___BYTES___METHODDEF
     {"capitalize", stringlib_capitalize, METH_NOARGS,
      _Py_capitalize__doc__},