Mercurial > cpython-lru_cache-weakref

diff Objects/rangeobject.c @ 57267:3ebf907db028

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Fix another case of potential signed overflow.
author Mark Dickinson <dickinsm@gmail.com>
date Sun, 15 Nov 2009 12:56:08 +0000
parents 2aa62fce0bf8
children eb235eb45d32
line wrap: on
line diff
--- a/Objects/rangeobject.c	Sun Nov 15 12:34:44 2009 +0000
+++ b/Objects/rangeobject.c	Sun Nov 15 12:56:08 2009 +0000
@@ -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;
 }