changeset: 79532:906ae6485cb8
branch: 3.3
parent: 79529:152d85b2da3a
user: Mark Dickinson <mdickinson@enthought.com>
date: Sat Oct 06 18:50:02 2012 +0100
files: Objects/longobject.c
description:
Issue #16096: Fix signed overflow in Objects/longobject.c. Thanks Serhiy Storchaka.
diff -r 152d85b2da3a -r 906ae6485cb8 Objects/longobject.c
--- a/Objects/longobject.c	Sat Oct 06 18:04:49 2012 +0100
+++ b/Objects/longobject.c	Sat Oct 06 18:50:02 2012 +0100
@@ -668,10 +668,9 @@
 assert(ndigits == 0 &#124;&#124; v->ob_digit[ndigits - 1] != 0);
 if (ndigits> 0) {
 digit msd = v->ob_digit[ndigits - 1];
-
- result = (ndigits - 1) * PyLong_SHIFT;
- if (result / PyLong_SHIFT != (size_t)(ndigits - 1))
+ if ((size_t)(ndigits - 1)> PY_SIZE_MAX / (size_t)PyLong_SHIFT)
 goto Overflow;
+ result = (size_t)(ndigits - 1) * (size_t)PyLong_SHIFT;
 do {
 ++result;
 if (result == 0)
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