diff options
author | Explorer09 <explorer09@gmail.com> | 2017-01-19 16:04:13 +0800 |
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committer | Will Estes <westes575@gmail.com> | 2017-01-24 07:36:50 -0500 |
commit | 9c54eb6e30459e74a4de37822b497b0b3dc73995 (patch) | |
tree | 9873d7f6025031e99907508f895c2a4566960069 /lib | |
parent | 7e4d5387247f4933fccc90539797e4ab4b50e2dd (diff) |
build: detect overflow for [re]allocate_array.
Use reallocarray() when we have it (i.e. in OpenBSD system). When we
don't, use equivalent overflow detection for our allocate_array and
reallocate_array functions.
Remove lib/reallocarray.c from our LIBOBJS as we no longer need it.
Provide a fallback SIZE_MAX macro definition in flexint.h (not
preprocessor friendly, but enough for our reallocate_array use case).
Diffstat (limited to 'lib')
-rw-r--r-- | lib/reallocarray.c | 49 |
1 files changed, 0 insertions, 49 deletions
diff --git a/lib/reallocarray.c b/lib/reallocarray.c deleted file mode 100644 index 0c1e250..0000000 --- a/lib/reallocarray.c +++ /dev/null @@ -1,49 +0,0 @@ -/* $OpenBSD: reallocarray.c,v 1.2 2014/12/08 03:45:00 bcook Exp $ */ -/* - * Copyright (c) 2008 Otto Moerbeek <otto@drijf.net> - * - * Permission to use, copy, modify, and distribute this software for any - * purpose with or without fee is hereby granted, provided that the above - * copyright notice and this permission notice appear in all copies. - * - * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES - * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF - * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR - * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES - * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN - * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF - * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. - */ - -/* OPENBSD ORIGINAL: lib/libc/stdlib/reallocarray.c */ - -#include <config.h> -#ifndef HAVE_REALLOCARRAY -#undef reallocarray - -#include <sys/types.h> -#include <errno.h> -#ifdef HAVE_STDINT_H -#include <stdint.h> -#endif -#include <stdlib.h> - -void *reallocarray(void *, size_t, size_t); - -/* - * 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 ((size_t)1 << (sizeof(size_t) * 4)) - -void * -reallocarray(void *optr, size_t nmemb, size_t size) -{ - if ((nmemb >= MUL_NO_OVERFLOW || size >= MUL_NO_OVERFLOW) && - nmemb > 0 && SIZE_MAX / nmemb < size) { - errno = ENOMEM; - return NULL; - } - return realloc(optr, size * nmemb); -} -#endif /* HAVE_REALLOCARRAY */ |