1 /* alloc - Convenience routines for safely allocating memory
2 * Copyright (C) 2007,2008,2009 Josh Coalson
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
8 * - Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * - Neither the name of the Xiph.org Foundation nor the names of its
16 * contributors may be used to endorse or promote products derived from
17 * this software without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
23 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
24 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
26 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
27 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
28 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
29 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 #ifndef FLAC__SHARE__ALLOC_H
33 #define FLAC__SHARE__ALLOC_H
39 /* WATCHOUT: for c++ you may have to #define __STDC_LIMIT_MACROS 1 real early
40 * before #including this file, otherwise SIZE_MAX might not be defined
43 #include <limits.h> /* for SIZE_MAX */
45 #include <stdint.h> /* for SIZE_MAX in case limits.h didn't get it */
47 #include <stdlib.h> /* for size_t, malloc(), etc */
48 #include "share/compat.h"
54 # define SIZE_T_MAX 0xffffffffffffffffui64
56 # define SIZE_T_MAX 0xffffffff
62 # define SIZE_MAX SIZE_T_MAX
65 /* avoid malloc()ing 0 bytes, see:
66 * https://www.securecoding.cert.org/confluence/display/seccode/MEM04-A.+Do+not+make+assumptions+about+the+result+of+allocating+0+bytes?focusedCommentId=5407003
68 static inline void *safe_malloc_(size_t size)
70 /* malloc(0) is undefined; FLAC src convention is to always allocate */
76 static inline void *safe_calloc_(size_t nmemb, size_t size)
79 return malloc(1); /* malloc(0) is undefined; FLAC src convention is to always allocate */
80 return calloc(nmemb, size);
83 /*@@@@ there's probably a better way to prevent overflows when allocating untrusted sums but this works for now */
85 static inline void *safe_malloc_add_2op_(size_t size1, size_t size2)
90 return safe_malloc_(size2);
93 static inline void *safe_malloc_add_3op_(size_t size1, size_t size2, size_t size3)
101 return safe_malloc_(size3);
104 static inline void *safe_malloc_add_4op_(size_t size1, size_t size2, size_t size3, size_t size4)
115 return safe_malloc_(size4);
118 void *safe_malloc_mul_2op_(size_t size1, size_t size2) ;
120 static inline void *safe_malloc_mul_3op_(size_t size1, size_t size2, size_t size3)
122 if(!size1 || !size2 || !size3)
123 return malloc(1); /* malloc(0) is undefined; FLAC src convention is to always allocate */
124 if(size1 > SIZE_MAX / size2)
127 if(size1 > SIZE_MAX / size3)
129 return malloc(size1*size3);
132 /* size1*size2 + size3 */
133 static inline void *safe_malloc_mul2add_(size_t size1, size_t size2, size_t size3)
136 return safe_malloc_(size3);
137 if(size1 > SIZE_MAX / size2)
139 return safe_malloc_add_2op_(size1*size2, size3);
142 /* size1 * (size2 + size3) */
143 static inline void *safe_malloc_muladd2_(size_t size1, size_t size2, size_t size3)
145 if(!size1 || (!size2 && !size3))
146 return malloc(1); /* malloc(0) is undefined; FLAC src convention is to always allocate */
150 if(size1 > SIZE_MAX / size2)
152 return malloc(size1*size2);
155 static inline void *safe_realloc_add_2op_(void *ptr, size_t size1, size_t size2)
160 return realloc(ptr, size2);
163 static inline void *safe_realloc_add_3op_(void *ptr, size_t size1, size_t size2, size_t size3)
171 return realloc(ptr, size3);
174 static inline void *safe_realloc_add_4op_(void *ptr, size_t size1, size_t size2, size_t size3, size_t size4)
185 return realloc(ptr, size4);
188 static inline void *safe_realloc_mul_2op_(void *ptr, size_t size1, size_t size2)
191 return realloc(ptr, 0); /* preserve POSIX realloc(ptr, 0) semantics */
192 if(size1 > SIZE_MAX / size2)
194 return realloc(ptr, size1*size2);
197 /* size1 * (size2 + size3) */
198 static inline void *safe_realloc_muladd2_(void *ptr, size_t size1, size_t size2, size_t size3)
200 if(!size1 || (!size2 && !size3))
201 return realloc(ptr, 0); /* preserve POSIX realloc(ptr, 0) semantics */
205 return safe_realloc_mul_2op_(ptr, size1, size2);