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111 lines
4.2 KiB
C
111 lines
4.2 KiB
C
/*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/* $OpenBSD: reallocarray.c,v 1.1 2014/05/08 21:43:49 deraadt Exp $ */
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/*
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* Copyright (c) 2008 Otto Moerbeek <otto@drijf.net>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/types.h>
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#include <errno.h>
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#include <stdint.h>
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#include <stdlib.h>
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#ifndef SIZE_MAX
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#define SIZE_MAX UINTPTR_MAX
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#endif
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/*
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* This is sqrt(SIZE_MAX+1), as s1*s2 <= SIZE_MAX
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* if both s1 < MUL_NO_OVERFLOW and s2 < MUL_NO_OVERFLOW
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*/
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#define MUL_NO_OVERFLOW ((size_t)1 << (sizeof(size_t) * 4))
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void *
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openbsd_reallocarray(void *optr, size_t nmemb, size_t size)
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{
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if ((nmemb >= MUL_NO_OVERFLOW || size >= MUL_NO_OVERFLOW) &&
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nmemb > 0 && SIZE_MAX / nmemb < size) {
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errno = ENOMEM;
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return NULL;
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}
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/*
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* Head off variations in realloc behavior on different
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* platforms (reported by MarkR <mrogers6@users.sf.net>)
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*
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* The behaviour of reallocarray is implementation-defined if
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* nmemb or size is zero. It can return NULL or non-NULL
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* depending on the platform.
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* https://www.securecoding.cert.org/confluence/display/c/MEM04-C.Beware+of+zero-lengthallocations
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*
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* Here are some extracts from realloc man pages on different platforms.
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*
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* void realloc( void memblock, size_t size );
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*
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* Windows:
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*
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* If there is not enough available memory to expand the block
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* to the given size, the original block is left unchanged,
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* and NULL is returned. If size is zero, then the block
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* pointed to by memblock is freed; the return value is NULL,
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* and memblock is left pointing at a freed block.
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*
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* OpenBSD:
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*
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* If size or nmemb is equal to 0, a unique pointer to an
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* access protected, zero sized object is returned. Access via
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* this pointer will generate a SIGSEGV exception.
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*
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* Linux:
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*
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* If size was equal to 0, either NULL or a pointer suitable
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* to be passed to free() is returned.
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*
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* OS X:
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*
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* If size is zero and ptr is not NULL, a new, minimum sized
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* object is allocated and the original object is freed.
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*
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* It looks like images with zero width or height can trigger
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* this, and fuzzing behaviour will differ by platform, so
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* fuzzing on one platform may not detect zero-size allocation
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* problems on other platforms.
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*/
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if (size == 0 || nmemb == 0)
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return NULL;
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return realloc(optr, size * nmemb);
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}
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