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kristjanvalurkristjanvalur
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Make the various iterators' "setstate" sliently and consistently clip the
index. This avoids the possibility of setting an iterator to an invalid state.
1 parent 4ca688e commit 25dded0

8 files changed

Lines changed: 66 additions & 15 deletions

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‎Lib/test/test_range.py‎

Lines changed: 12 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -380,6 +380,18 @@ def test_iterator_pickling(self):
380380
self.assertEqual(list(it), data[1:])
381381

382382
def test_exhausted_iterator_pickling(self):
383+
r = range(2**65, 2**65+2)
384+
i = iter(r)
385+
while True:
386+
r = next(i)
387+
if r == 2**65+1:
388+
break
389+
d = pickle.dumps(i)
390+
i2 = pickle.loads(d)
391+
self.assertEqual(list(i), [])
392+
self.assertEqual(list(i2), [])
393+
394+
def test_large_exhausted_iterator_pickling(self):
383395
r = range(20)
384396
i = iter(r)
385397
while True:

‎Modules/arraymodule.c‎

Lines changed: 2 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -2798,6 +2798,8 @@ arrayiter_setstate(arrayiterobject *it, PyObject *state)
27982798
return NULL;
27992799
if (index < 0)
28002800
index = 0;
2801+
else if (index > Py_SIZE(it->ao))
2802+
index = Py_SIZE(it->ao); /* iterator exhausted */
28012803
it->index = index;
28022804
Py_RETURN_NONE;
28032805
}

‎Objects/bytearrayobject.c‎

Lines changed: 7 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -3043,9 +3043,13 @@ bytearrayiter_setstate(bytesiterobject *it, PyObject *state)
30433043
Py_ssize_t index = PyLong_AsSsize_t(state);
30443044
if (index == -1 && PyErr_Occurred())
30453045
return NULL;
3046-
if (index < 0)
3047-
index = 0;
3048-
it->it_index = index;
3046+
if (it->it_seq != NULL) {
3047+
if (index < 0)
3048+
index = 0;
3049+
else if (index > PyByteArray_GET_SIZE(it->it_seq))
3050+
index = PyByteArray_GET_SIZE(it->it_seq); /* iterator exhausted */
3051+
it->it_index = index;
3052+
}
30493053
Py_RETURN_NONE;
30503054
}
30513055

‎Objects/bytesobject.c‎

Lines changed: 7 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -2996,9 +2996,13 @@ striter_setstate(striterobject *it, PyObject *state)
29962996
Py_ssize_t index = PyLong_AsSsize_t(state);
29972997
if (index == -1 && PyErr_Occurred())
29982998
return NULL;
2999-
if (index < 0)
3000-
index = 0;
3001-
it->it_index = index;
2999+
if (it->it_seq != NULL) {
3000+
if (index < 0)
3001+
index = 0;
3002+
else if (index > PyBytes_GET_SIZE(it->it_seq))
3003+
index = PyBytes_GET_SIZE(it->it_seq); /* iterator exhausted */
3004+
it->it_index = index;
3005+
}
30023006
Py_RETURN_NONE;
30033007
}
30043008

‎Objects/listobject.c‎

Lines changed: 2 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -2803,6 +2803,8 @@ listiter_setstate(listiterobject *it, PyObject *state)
28032803
if (it->it_seq != NULL) {
28042804
if (index < 0)
28052805
index = 0;
2806+
else if (index > PyList_GET_SIZE(it->it_seq))
2807+
index = PyList_GET_SIZE(it->it_seq); /* iterator exhausted */
28062808
it->it_index = index;
28072809
}
28082810
Py_RETURN_NONE;

‎Objects/rangeobject.c‎

Lines changed: 27 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -1000,10 +1000,11 @@ rangeiter_setstate(rangeiterobject *r, PyObject *state)
10001000
long index = PyLong_AsLong(state);
10011001
if (index == -1 && PyErr_Occurred())
10021002
return NULL;
1003-
if (index < 0 || index > r->len) {
1004-
PyErr_SetString(PyExc_ValueError, "index out of range");
1005-
return NULL;
1006-
}
1003+
/* silently clip the index value */
1004+
if (index < 0)
1005+
index = 0;
1006+
else if (index > r->len)
1007+
index = r->len; /* exhausted iterator */
10071008
r->index = index;
10081009
Py_RETURN_NONE;
10091010
}
@@ -1178,6 +1179,28 @@ longrangeiter_reduce(longrangeiterobject *r)
11781179
static PyObject *
11791180
longrangeiter_setstate(longrangeiterobject *r, PyObject *state)
11801181
{
1182+
int cmp;
1183+
1184+
/* clip the value */
1185+
PyObject *zero = PyLong_FromLong(0);
1186+
if (zero == NULL)
1187+
return NULL;
1188+
cmp = PyObject_RichCompareBool(state, zero, Py_LT);
1189+
if (cmp > 0) {
1190+
Py_CLEAR(r->index);
1191+
r->index = zero;
1192+
Py_RETURN_NONE;
1193+
}
1194+
Py_DECREF(zero);
1195+
if (cmp < 0)
1196+
return NULL;
1197+
1198+
cmp = PyObject_RichCompareBool(r->len, state, Py_LT);
1199+
if (cmp < 0)
1200+
return NULL;
1201+
if (cmp > 0)
1202+
state = r->len;
1203+
11811204
Py_CLEAR(r->index);
11821205
r->index = state;
11831206
Py_INCREF(r->index);

‎Objects/tupleobject.c‎

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -998,8 +998,8 @@ tupleiter_setstate(tupleiterobject *it, PyObject *state)
998998
if (it->it_seq != NULL) {
999999
if (index < 0)
10001000
index = 0;
1001-
else if (it->it_seq != NULL && index > PyTuple_GET_SIZE(it->it_seq))
1002-
index = PyTuple_GET_SIZE(it->it_seq);
1001+
else if (index > PyTuple_GET_SIZE(it->it_seq))
1002+
index = PyTuple_GET_SIZE(it->it_seq); /* exhausted iterator */
10031003
it->it_index = index;
10041004
}
10051005
Py_RETURN_NONE;

‎Objects/unicodeobject.c‎

Lines changed: 7 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -14420,9 +14420,13 @@ unicodeiter_setstate(unicodeiterobject *it, PyObject *state)
1442014420
Py_ssize_t index = PyLong_AsSsize_t(state);
1442114421
if (index == -1 && PyErr_Occurred())
1442214422
return NULL;
14423-
if (index < 0)
14424-
index = 0;
14425-
it->it_index = index;
14423+
if (it->it_seq != NULL) {
14424+
if (index < 0)
14425+
index = 0;
14426+
else if (index > PyUnicode_GET_LENGTH(it->it_seq))
14427+
index = PyUnicode_GET_LENGTH(it->it_seq); /* iterator truncated */
14428+
it->it_index = index;
14429+
}
1442614430
Py_RETURN_NONE;
1442714431
}
1442814432

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