gh-111178: fix UBSan failures in `Objects/descrobject.c` (GH-128245)

fix UBSan failures for `propertyobject`

diff --git a/Objects/descrobject.c b/Objects/descrobject.c
index 4eccd1704eb95a29f1ea66efa05321a11aefa6e1..1852118359f0144f8e20a5ba0e361debc73e0496 100644 (file)
--- a/Objects/descrobject.c
+++ b/Objects/descrobject.c
@@ -1508,6 +1508,8 @@ PyWrapper_New(PyObject *d, PyObject *self)
 
 /* A built-in 'property' type */
 
+#define _propertyobject_CAST(op)    ((propertyobject *)(op))
+
 /*
 class property(object):
 
@@ -1911,8 +1913,9 @@ property_init_impl(propertyobject *self, PyObject *fget, PyObject *fset,
 }
 
 static PyObject *
-property_get__name__(propertyobject *prop, void *Py_UNUSED(ignored))
+property_get__name__(PyObject *op, void *Py_UNUSED(ignored))
 {
+    propertyobject *prop = _propertyobject_CAST(op);
     PyObject *name;
     if (property_name(prop, &name) < 0) {
         return NULL;
@@ -1925,16 +1928,17 @@ property_get__name__(propertyobject *prop, void *Py_UNUSED(ignored))
 }
 
 static int
-property_set__name__(propertyobject *prop, PyObject *value,
-                     void *Py_UNUSED(ignored))
+property_set__name__(PyObject *op, PyObject *value, void *Py_UNUSED(ignored))
 {
+    propertyobject *prop = _propertyobject_CAST(op);
     Py_XSETREF(prop->prop_name, Py_XNewRef(value));
     return 0;
 }
 
 static PyObject *
-property_get___isabstractmethod__(propertyobject *prop, void *closure)
+property_get___isabstractmethod__(PyObject *op, void *closure)
 {
+    propertyobject *prop = _propertyobject_CAST(op);
     int res = _PyObject_IsAbstract(prop->prop_get);
     if (res == -1) {
         return NULL;
@@ -1962,9 +1966,8 @@ property_get___isabstractmethod__(propertyobject *prop, void *closure)
 }
 
 static PyGetSetDef property_getsetlist[] = {
-    {"__name__", (getter)property_get__name__, (setter)property_set__name__},
-    {"__isabstractmethod__",
-     (getter)property_get___isabstractmethod__, NULL,
+    {"__name__", property_get__name__, property_set__name__, NULL, NULL},
+    {"__isabstractmethod__", property_get___isabstractmethod__, NULL,
      NULL,
      NULL},
     {NULL} /* Sentinel */