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gh-111178: fix UBSan failures in Objects/tupleobject.c #128251

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merged 1 commit into from
Jan 3, 2025
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gh-111178: fix UBSan failures in Objects/tupleobject.c #128251

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34 changes: 20 additions & 14 deletions Objects/tupleobject.c
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Original file line number Diff line number Diff line change
Expand Up @@ -988,26 +988,29 @@ _PyTuple_Resize(PyObject **pv, Py_ssize_t newsize)

/*********************** Tuple Iterator **************************/

#define _PyTupleIterObject_CAST(op) ((_PyTupleIterObject *)(op))

static void
tupleiter_dealloc(_PyTupleIterObject *it)
tupleiter_dealloc(PyObject *self)
{
_PyTupleIterObject *it = _PyTupleIterObject_CAST(self);
_PyObject_GC_UNTRACK(it);
Py_XDECREF(it->it_seq);
PyObject_GC_Del(it);
}

static int
tupleiter_traverse(_PyTupleIterObject *it, visitproc visit, void *arg)
tupleiter_traverse(PyObject *self, visitproc visit, void *arg)
{
_PyTupleIterObject *it = _PyTupleIterObject_CAST(self);
Py_VISIT(it->it_seq);
return 0;
}

static PyObject *
tupleiter_next(PyObject *obj)
tupleiter_next(PyObject *self)
{
_PyTupleIterObject *it = (_PyTupleIterObject *)obj;
_PyTupleIterObject *it = _PyTupleIterObject_CAST(self);
PyTupleObject *seq;
PyObject *item;

Expand All @@ -1029,8 +1032,9 @@ tupleiter_next(PyObject *obj)
}

static PyObject *
tupleiter_len(_PyTupleIterObject *it, PyObject *Py_UNUSED(ignored))
tupleiter_len(PyObject *self, PyObject *Py_UNUSED(ignored))
{
_PyTupleIterObject *it = _PyTupleIterObject_CAST(self);
Py_ssize_t len = 0;
if (it->it_seq)
len = PyTuple_GET_SIZE(it->it_seq) - it->it_index;
Expand All @@ -1040,13 +1044,14 @@ tupleiter_len(_PyTupleIterObject *it, PyObject *Py_UNUSED(ignored))
PyDoc_STRVAR(length_hint_doc, "Private method returning an estimate of len(list(it)).");

static PyObject *
tupleiter_reduce(_PyTupleIterObject *it, PyObject *Py_UNUSED(ignored))
tupleiter_reduce(PyObject *self, PyObject *Py_UNUSED(ignored))
{
PyObject *iter = _PyEval_GetBuiltin(&_Py_ID(iter));

/* _PyEval_GetBuiltin can invoke arbitrary code,
* call must be before access of iterator pointers.
* see issue #101765 */
_PyTupleIterObject *it = _PyTupleIterObject_CAST(self);

if (it->it_seq)
return Py_BuildValue("N(O)n", iter, it->it_seq, it->it_index);
Expand All @@ -1055,8 +1060,9 @@ tupleiter_reduce(_PyTupleIterObject *it, PyObject *Py_UNUSED(ignored))
}

static PyObject *
tupleiter_setstate(_PyTupleIterObject *it, PyObject *state)
tupleiter_setstate(PyObject *self, PyObject *state)
{
_PyTupleIterObject *it = _PyTupleIterObject_CAST(self);
Py_ssize_t index = PyLong_AsSsize_t(state);
if (index == -1 && PyErr_Occurred())
return NULL;
Expand All @@ -1074,19 +1080,19 @@ PyDoc_STRVAR(reduce_doc, "Return state information for pickling.");
PyDoc_STRVAR(setstate_doc, "Set state information for unpickling.");

static PyMethodDef tupleiter_methods[] = {
{"__length_hint__", (PyCFunction)tupleiter_len, METH_NOARGS, length_hint_doc},
{"__reduce__", (PyCFunction)tupleiter_reduce, METH_NOARGS, reduce_doc},
{"__setstate__", (PyCFunction)tupleiter_setstate, METH_O, setstate_doc},
{NULL, NULL} /* sentinel */
{"__length_hint__", tupleiter_len, METH_NOARGS, length_hint_doc},
{"__reduce__", tupleiter_reduce, METH_NOARGS, reduce_doc},
{"__setstate__", tupleiter_setstate, METH_O, setstate_doc},
{NULL, NULL, 0, NULL} /* sentinel */
};

PyTypeObject PyTupleIter_Type = {
PyVarObject_HEAD_INIT(&PyType_Type, 0)
"tuple_iterator", /* tp_name */
sizeof(_PyTupleIterObject), /* tp_basicsize */
sizeof(_PyTupleIterObject), /* tp_basicsize */
0, /* tp_itemsize */
/* methods */
(destructor)tupleiter_dealloc, /* tp_dealloc */
tupleiter_dealloc, /* tp_dealloc */
0, /* tp_vectorcall_offset */
0, /* tp_getattr */
0, /* tp_setattr */
Expand All @@ -1103,7 +1109,7 @@ PyTypeObject PyTupleIter_Type = {
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,/* tp_flags */
0, /* tp_doc */
(traverseproc)tupleiter_traverse, /* tp_traverse */
tupleiter_traverse, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
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