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annotate pws.c @ 9:ec5c1b653ee6

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Prevent NULL pointer dereference Creating the end field may fail, thus try to allocate it in advance.
author Guido Berhoerster <guido+libpws@berhoerster.name>
date Tue, 30 Jul 2019 14:52:29 +0200
parents d541e748cfd8
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1 /*
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2 * Copyright (C) 2015 Guido Berhoerster <guido+libpws@berhoerster.name>
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3 *
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4 * Permission is hereby granted, free of charge, to any person obtaining
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5 * a copy of this software and associated documentation files (the
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6 * "Software"), to deal in the Software without restriction, including
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7 * without limitation the rights to use, copy, modify, merge, publish,
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8 * distribute, sublicense, and/or sell copies of the Software, and to
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9 * permit persons to whom the Software is furnished to do so, subject to
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10 * the following conditions:
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11 *
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12 * The above copyright notice and this permission notice shall be included
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13 * in all copies or substantial portions of the Software.
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14 *
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15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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16 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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18 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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19 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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20 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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21 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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22 */
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23
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24 #include "compat.h"
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25
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26 #include <stdlib.h>
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27 #include <string.h>
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28
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29 #include "pws-internal.h"
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30
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31 static void default_free(void *, size_t);
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32
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33 void * (*pws_alloc)(size_t) = malloc;
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34 void * (*pws_realloc)(void *, size_t) = realloc;
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35 void (*pws_free)(void *, size_t) = default_free;
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36 void * (*pws_secure_alloc)(size_t) = malloc;
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37 void * (*pws_secure_realloc)(void *, size_t) = realloc;
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38 void (*pws_secure_free)(void *, size_t) = default_free;
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39
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40 int
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41 pws_init(void)
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42 {
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43 return (0);
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44 }
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45
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46 void
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47 pws_finalize(void)
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48 {
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49 }
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50
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51 static void
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52 default_free(void *ptr, size_t n)
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53 {
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54 free(ptr);
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55 }
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56
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57 void
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58 pws_set_alloc_functions(void *(*alloc_function)(size_t),
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59 void *(*realloc_function)(void *, size_t),
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60 void (*free_function)(void *, size_t),
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61 void *(*secure_alloc_function)(size_t),
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62 void *(*secure_realloc_function)(void *, size_t),
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63 void (*secure_free_function)(void *, size_t))
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64 {
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65 pws_alloc = (alloc_function != NULL) ? alloc_function : malloc;
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66 pws_realloc = (realloc_function != NULL) ? realloc_function : realloc;
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67 pws_free = (free_function != NULL) ? free_function : default_free;
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68 pws_secure_alloc = (secure_alloc_function != NULL) ?
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69 secure_alloc_function : malloc;
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70 pws_secure_realloc = (secure_realloc_function != NULL) ?
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71 secure_realloc_function : realloc;
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72 pws_secure_free = (secure_free_function != NULL) ?
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73 secure_free_function : default_free;
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74 }
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75
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76 int
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77 pws_generate_uuid(unsigned char uuid[static PWS3_UUID_SIZE])
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78 {
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79 unsigned char buf[PWS3_UUID_SIZE];
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80
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81 if (pws_random_bytes(buf, sizeof (buf)) != 0) {
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82 return (-1);
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83 }
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84
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85 /* UUID v4 from RFC 4122, section 4.4 */
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86 buf[6] = (buf[6] & 0x0f) | 0x40;
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87 buf[8] = (buf[8] & 0x3f) | 0x80;
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88 memcpy(uuid, buf, sizeof (buf));
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89
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90 return (0);
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91 }