Fix a possible crash in range.__reversed__(). (GH-10252)

ZackerySpytz · serhiy-storchaka · commit c9a6168924ff · 2018-10-31T11:13:16.000+02:00
diff --git a/Objects/rangeobject.c b/Objects/rangeobject.c
@@ -1154,6 +1154,7 @@ range_reverse(PyObject *seq, PyObject *Py_UNUSED(ignored))
     it = PyObject_New(longrangeiterobject, &PyLongRangeIter_Type);
     if (it == NULL)
         return NULL;
+    it->index = it->start = it->step = NULL;
 
     /* start + (len - 1) * step */
     it->len = range->length;
