[Python-checkins] r76298 - python/branches/py3k/Objects/rangeobject.c

[mark.dickinson]

Author: mark.dickinson
Date: Sun Nov 15 13:56:08 2009
New Revision: 76298

Log:
Fix another case of potential signed overflow.

Modified:
   python/branches/py3k/Objects/rangeobject.c

Modified: python/branches/py3k/Objects/rangeobject.c
==============================================================================
--- python/branches/py3k/Objects/rangeobject.c	(original)
+++ python/branches/py3k/Objects/rangeobject.c	Sun Nov 15 13:56:08 2009
@@ -411,7 +411,10 @@
 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;
 }