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bf29ee6917
In a similar model as _safe_*alloc api but for the `userland` it guards against overflow before (re)allocation, usage concealed in fpm for now. Modern Linux and most of BSD already have it. Closes #8871.
41 lines
1.4 KiB
C
41 lines
1.4 KiB
C
/*
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+----------------------------------------------------------------------+
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| Copyright (c) The PHP Group |
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+----------------------------------------------------------------------+
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| This source file is subject to version 3.01 of the PHP license, |
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| that is bundled with this package in the file LICENSE, and is |
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| available through the world-wide-web at the following url: |
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| https://www.php.net/license/3_01.txt |
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| If you did not receive a copy of the PHP license and are unable to |
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| obtain it through the world-wide-web, please send a note to |
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| license@php.net so we can mail you a copy immediately. |
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+----------------------------------------------------------------------+
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| Author: David Carlier <devnexen@gmail.com> |
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+----------------------------------------------------------------------+
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*/
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#include "php.h"
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#ifndef HAVE_REALLOCARRAY
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#include <string.h>
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PHPAPI void* php_reallocarray(void *p, size_t nmb, size_t siz)
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{
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size_t r;
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#ifndef _WIN32
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if (__builtin_mul_overflow(nmb, siz, &r)) {
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#else
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r = siz * nmb;
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if (siz != 0 && r / siz != nmb) {
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#endif
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// EOVERFLOW may have been, arguably, more appropriate
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// but this is what other implementations set
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errno = ENOMEM;
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return NULL;
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}
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return realloc(p, r);
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}
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#endif
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