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gh-111178: fix UBSan failures in Objects/descrobject.c #128245

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gh-111178: fix UBSan failures in Objects/descrobject.c #128245

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17 changes: 10 additions & 7 deletions Objects/descrobject.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1508,6 +1508,8 @@ PyWrapper_New(PyObject *d, PyObject *self)

/* A built-in 'property' type */

#define _propertyobject_CAST(op) ((propertyobject *)(op))

/*
class property(object):

Expand Down Expand Up @@ -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;
Expand All @@ -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;
Expand Down Expand Up @@ -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},
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This makes me wonder: what's your reason for adding the NULLs?
(C only needs one value and zeroes the rest, and many of these structs have more rarely used stuff at the end -- though perhaps the reasons for that are more historical than ergonomic.)

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@picnixz picnixz Jan 3, 2025 •
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I feel that if we have a half-initialized object, it's somewhat harder for new readers to know that there's still the NULL doc field and closure. I think I'm unfortunately not constant in where I'm adding those NULLs so feel free to remove them (but since I was anyway modifying the line, I took the initiative of keeping them).

{"__isabstractmethod__", property_get___isabstractmethod__, NULL,
NULL,
NULL},
{NULL} /* Sentinel */
Expand Down
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