commit da15389fddb85cf8a97b81e75de7d77b5f505b56
author Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com> Wed Oct 31 02:31:29 2018 -0700
committer GitHub <noreply@github.com> Wed Oct 31 02:31:29 2018 -0700
tree 488539656f842787c387b6fecbe2242e71f24763
parent b183750f999953bac7738b1fff114e0a2615d970

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

(cherry picked from commit c9a6168924ffa4f3f78175998b392fe23d3edc50)

Co-authored-by: Zackery Spytz <zspytz@gmail.com>

Objects/rangeobject.c

diff --git a/Objects/rangeobject.c b/Objects/rangeobject.c
index e4f778b..037be87 100644
--- a/Objects/rangeobject.c
+++ b/Objects/rangeobject.c
@@ -1154,6 +1154,7 @@
     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;