From b43dbc26f9abbd6bf96bd95e6701719575c57341 Mon Sep 17 00:00:00 2001
From: Mark Dickinson <dickinsm@gmail.com>
Date: Sun, 15 Nov 2009 12:56:08 +0000
Subject: [PATCH] Fix another case of potential signed overflow.

---
 Objects/rangeobject.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Objects/rangeobject.c b/Objects/rangeobject.c
index cabe7852568..ec75c8fcfe1 100644
--- a/Objects/rangeobject.c
+++ b/Objects/rangeobject.c
@@ -411,7 +411,10 @@ static PyObject *
 rangeiter_next(rangeiterobject *r)
 {
     if (r->index < r->len)
-        return PyLong_FromLong(r->start + (r->index++) * r->step);
+        /* cast to unsigned to avoid possible signed overflow 
+           in intermediate calculations. */
+        return PyLong_FromLong((long)(r->start +
+                                      (unsigned long)(r->index++) * r->step));
     return NULL;
 }