From a1205ef524ad5aa97af08ef77753271a84936fba Mon Sep 17 00:00:00 2001
From: =?utf8?q?B=C3=A9n=C3=A9dikt=20Tran?=
 <10796600+picnixz@users.noreply.github.com>
Date: Mon, 24 Mar 2025 11:02:09 +0100
Subject: [PATCH] gh-111178: fix UBSan failures for `PyBytesObject` (#131603)

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

diff --git a/Objects/bytesobject.c b/Objects/bytesobject.c
index bdb389eb2582..31ba89ffb183 100644
--- a/Objects/bytesobject.c
+++ b/Objects/bytesobject.c
@@ -2649,15 +2649,16 @@ 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__},
-- 
2.47.3