diff --git a/Lib/ctypes/test/test_struct_fields.py b/Lib/ctypes/test/test_struct_fields.py
index fefeaea1496a3e..e444f5e1f77919 100644
--- a/Lib/ctypes/test/test_struct_fields.py
+++ b/Lib/ctypes/test/test_struct_fields.py
@@ -54,6 +54,12 @@ class X(Structure):
x.char = b'a\0b\0'
self.assertEqual(bytes(x), b'a\x00###')
+ def test_6(self):
+ class X(Structure):
+ _fields_ = [("x", c_int)]
+ CField = type(X.x)
+ self.assertRaises(TypeError, CField)
+
def test_gh99275(self):
class BrokenStructure(Structure):
def __init_subclass__(cls, **kwargs):
diff --git a/Misc/NEWS.d/next/Library/2022-12-19-20-54-04.gh-issue-78878.JrkYqJ.rst b/Misc/NEWS.d/next/Library/2022-12-19-20-54-04.gh-issue-78878.JrkYqJ.rst
new file mode 100644
index 00000000000000..8b455fd2ef7ff0
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2022-12-19-20-54-04.gh-issue-78878.JrkYqJ.rst
@@ -0,0 +1 @@
+Fix crash when creating an instance of :class:`!_ctypes.CField`.
diff --git a/Modules/_ctypes/cfield.c b/Modules/_ctypes/cfield.c
index 13ed8b7eda6555..9bdf1db856e7bb 100644
--- a/Modules/_ctypes/cfield.c
+++ b/Modules/_ctypes/cfield.c
@@ -30,13 +30,6 @@ static void pymem_destructor(PyObject *ptr)
/*
PyCField_Type
*/
-static PyObject *
-PyCField_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
-{
- CFieldObject *obj;
- obj = (CFieldObject *)type->tp_alloc(type, 0);
- return (PyObject *)obj;
-}
/*
* Expects the size, index and offset for the current field in *psize and
@@ -68,7 +61,7 @@ PyCField_FromDesc(PyObject *desc, Py_ssize_t index,
#define CONT_BITFIELD 2
#define EXPAND_BITFIELD 3
- self = (CFieldObject *)_PyObject_CallNoArgs((PyObject *)&PyCField_Type);
+ self = (CFieldObject *)PyCField_Type.tp_alloc((PyTypeObject *)&PyCField_Type, 0);
if (self == NULL)
return NULL;
dict = PyType_stgdict(desc);
@@ -343,7 +336,7 @@ PyTypeObject PyCField_Type = {
0, /* tp_dictoffset */
0, /* tp_init */
0, /* tp_alloc */
- PyCField_new, /* tp_new */
+ 0, /* tp_new */
0, /* tp_free */
};
diff --git a/Modules/_ctypes/stgdict.c b/Modules/_ctypes/stgdict.c
index 88999b8dff1838..b7134ce2571b8f 100644
--- a/Modules/_ctypes/stgdict.c
+++ b/Modules/_ctypes/stgdict.c
@@ -258,7 +258,7 @@ MakeFields(PyObject *type, CFieldObject *descr,
}
continue;
}
- new_descr = (CFieldObject *)_PyObject_CallNoArgs((PyObject *)&PyCField_Type);
+ new_descr = (CFieldObject *)PyCField_Type.tp_alloc((PyTypeObject *)&PyCField_Type, 0);
if (new_descr == NULL) {
Py_DECREF(fdescr);
Py_DECREF(fieldlist);
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