From c7d93b761413834e0ac39f5fc648565a2843121f Mon Sep 17 00:00:00 2001
From: Mark Dickinson <mdickinson@enthought.com>
Date: Sun, 25 Sep 2011 15:34:32 +0100
Subject: Issue #1621: Fix undefined behaviour from signed overflow in datetime
 module hashes, array and list iterations, and get_integer
 (stringlib/string_format.h)

---
 Modules/arraymodule.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'Modules/arraymodule.c')

diff --git a/Modules/arraymodule.c b/Modules/arraymodule.c
index 5748a3c047..8806bd5f85 100644
--- a/Modules/arraymodule.c
+++ b/Modules/arraymodule.c
@@ -2351,7 +2351,7 @@ array_ass_subscr(arrayobject* self, PyObject* item, PyObject* value)
                 self->ob_item + (cur + 1) * itemsize,
                 lim * itemsize);
         }
-        cur = start + slicelength * step;
+        cur = start + (size_t)slicelength * step;
         if (cur < (size_t)Py_SIZE(self)) {
             memmove(self->ob_item + (cur-slicelength) * itemsize,
                 self->ob_item + cur * itemsize,
-- 
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