File: | os/reallocarray.c |
Location: | line 42, column 9 |
Description: | Call to 'realloc' has an allocation size of 0 bytes |
1 | /* $OpenBSD: reallocarray.c,v 1.2 2014/12/08 03:45:00 bcook Exp $ */ | |||
2 | /* | |||
3 | * Copyright (c) 2008 Otto Moerbeek <otto@drijf.net> | |||
4 | * | |||
5 | * Permission to use, copy, modify, and distribute this software for any | |||
6 | * purpose with or without fee is hereby granted, provided that the above | |||
7 | * copyright notice and this permission notice appear in all copies. | |||
8 | * | |||
9 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES | |||
10 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | |||
11 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR | |||
12 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |||
13 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |||
14 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |||
15 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |||
16 | */ | |||
17 | ||||
18 | #ifdef HAVE_DIX_CONFIG_H1 | |||
19 | #include <dix-config.h> | |||
20 | #endif | |||
21 | ||||
22 | #include <sys/types.h> | |||
23 | #include <errno(*__error()).h> | |||
24 | #include <stdint.h> | |||
25 | #include <stdlib.h> | |||
26 | #include "os.h" | |||
27 | ||||
28 | /* | |||
29 | * This is sqrt(SIZE_MAX+1), as s1*s2 <= SIZE_MAX | |||
30 | * if both s1 < MUL_NO_OVERFLOW and s2 < MUL_NO_OVERFLOW | |||
31 | */ | |||
32 | #define MUL_NO_OVERFLOW((size_t)1 << (sizeof(size_t) * 4)) ((size_t)1 << (sizeof(size_t) * 4)) | |||
33 | ||||
34 | void * | |||
35 | reallocarrayxreallocarray(void *optr, size_t nmemb, size_t size) | |||
36 | { | |||
37 | if ((nmemb >= MUL_NO_OVERFLOW((size_t)1 << (sizeof(size_t) * 4)) || size >= MUL_NO_OVERFLOW((size_t)1 << (sizeof(size_t) * 4))) && | |||
38 | nmemb > 0 && SIZE_MAX18446744073709551615ULL / nmemb < size) { | |||
| ||||
39 | errno(*__error()) = ENOMEM12; | |||
40 | return NULL((void*)0); | |||
41 | } | |||
42 | return realloc(optr, size * nmemb); | |||
| ||||
43 | } |