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Avoid left shift overflow in reallocarray

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Some 64-bit platforms (e.g. Windows 64) have a 32-bit long. So, shifting
1UL 32-bits to the left causes an overflow. This replaces the constant
1UL with (size_t)1 so that we get the correct constant size for the
platform.

Import from OpenBSD.

Signed-off-by: Guillem Jover <guillem@hadrons.org>
This commit is contained in:
Brent Cook 2014-12-13 08:55:59 +01:00 committed by Guillem Jover
parent 025b44800e
commit 9688ab26b9
1 changed files with 2 additions and 2 deletions
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4
src/reallocarray.c
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@ -1,4 +1,4 @@
/* $OpenBSD: reallocarray.c,v 1.1 2014/05/08 21:43:49 deraadt Exp $ */
/* $OpenBSD: reallocarray.c,v 1.2 2014/12/08 03:45:00 bcook Exp $ */
/*
* Copyright (c) 2008 Otto Moerbeek <otto@drijf.net>
*
@ -24,7 +24,7 @@
* This is sqrt(SIZE_MAX+1), as s1*s2 <= SIZE_MAX
* if both s1 < MUL_NO_OVERFLOW and s2 < MUL_NO_OVERFLOW
*/
#define MUL_NO_OVERFLOW (1UL << (sizeof(size_t) * 4))
#define MUL_NO_OVERFLOW ((size_t)1 << (sizeof(size_t) * 4))
void *
reallocarray(void *optr, size_t nmemb, size_t size)