1 | /*
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2 | * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
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3 | *
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4 | * Licensed under the OpenSSL license (the "License"). You may not use
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5 | * this file except in compliance with the License. You can obtain a copy
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6 | * in the file LICENSE in the source distribution or at
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7 | * https://www.openssl.org/source/license.html
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8 | */
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9 |
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10 | #include <stdio.h>
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11 | #include <limits.h>
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12 | #include "internal/cryptlib.h"
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13 | #include "internal/numbers.h"
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14 | #include <openssl/buffer.h>
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15 | #include <openssl/asn1.h>
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16 |
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17 | static int asn1_d2i_read_bio(BIO *in, BUF_MEM **pb);
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18 |
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19 | #ifndef NO_OLD_ASN1
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20 | # ifndef OPENSSL_NO_STDIO
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21 |
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22 | void *ASN1_d2i_fp(void *(*xnew) (void), d2i_of_void *d2i, FILE *in, void **x)
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23 | {
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24 | BIO *b;
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25 | void *ret;
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26 |
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27 | if ((b = BIO_new(BIO_s_file())) == NULL) {
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28 | ASN1err(ASN1_F_ASN1_D2I_FP, ERR_R_BUF_LIB);
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29 | return (NULL);
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30 | }
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31 | BIO_set_fp(b, in, BIO_NOCLOSE);
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32 | ret = ASN1_d2i_bio(xnew, d2i, b, x);
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33 | BIO_free(b);
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34 | return (ret);
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35 | }
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36 | # endif
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37 |
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38 | void *ASN1_d2i_bio(void *(*xnew) (void), d2i_of_void *d2i, BIO *in, void **x)
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39 | {
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40 | BUF_MEM *b = NULL;
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41 | const unsigned char *p;
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42 | void *ret = NULL;
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43 | int len;
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44 |
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45 | len = asn1_d2i_read_bio(in, &b);
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46 | if (len < 0)
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47 | goto err;
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48 |
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49 | p = (unsigned char *)b->data;
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50 | ret = d2i(x, &p, len);
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51 | err:
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52 | BUF_MEM_free(b);
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53 | return (ret);
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54 | }
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55 |
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56 | #endif
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57 |
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58 | void *ASN1_item_d2i_bio(const ASN1_ITEM *it, BIO *in, void *x)
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59 | {
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60 | BUF_MEM *b = NULL;
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61 | const unsigned char *p;
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62 | void *ret = NULL;
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63 | int len;
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64 |
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65 | len = asn1_d2i_read_bio(in, &b);
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66 | if (len < 0)
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67 | goto err;
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68 |
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69 | p = (const unsigned char *)b->data;
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70 | ret = ASN1_item_d2i(x, &p, len, it);
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71 | err:
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72 | BUF_MEM_free(b);
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73 | return (ret);
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74 | }
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75 |
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76 | #ifndef OPENSSL_NO_STDIO
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77 | void *ASN1_item_d2i_fp(const ASN1_ITEM *it, FILE *in, void *x)
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78 | {
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79 | BIO *b;
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80 | char *ret;
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81 |
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82 | if ((b = BIO_new(BIO_s_file())) == NULL) {
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83 | ASN1err(ASN1_F_ASN1_ITEM_D2I_FP, ERR_R_BUF_LIB);
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84 | return (NULL);
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85 | }
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86 | BIO_set_fp(b, in, BIO_NOCLOSE);
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87 | ret = ASN1_item_d2i_bio(it, b, x);
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88 | BIO_free(b);
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89 | return (ret);
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90 | }
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91 | #endif
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92 |
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93 | #define HEADER_SIZE 8
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94 | #define ASN1_CHUNK_INITIAL_SIZE (16 * 1024)
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95 | static int asn1_d2i_read_bio(BIO *in, BUF_MEM **pb)
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96 | {
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97 | BUF_MEM *b;
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98 | unsigned char *p;
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99 | int i;
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100 | size_t want = HEADER_SIZE;
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101 | uint32_t eos = 0;
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102 | size_t off = 0;
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103 | size_t len = 0;
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104 |
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105 | const unsigned char *q;
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106 | long slen;
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107 | int inf, tag, xclass;
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108 |
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109 | b = BUF_MEM_new();
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110 | if (b == NULL) {
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111 | ASN1err(ASN1_F_ASN1_D2I_READ_BIO, ERR_R_MALLOC_FAILURE);
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112 | return -1;
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113 | }
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114 |
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115 | ERR_clear_error();
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116 | for (;;) {
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117 | if (want >= (len - off)) {
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118 | want -= (len - off);
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119 |
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120 | if (len + want < len || !BUF_MEM_grow_clean(b, len + want)) {
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121 | ASN1err(ASN1_F_ASN1_D2I_READ_BIO, ERR_R_MALLOC_FAILURE);
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122 | goto err;
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123 | }
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124 | i = BIO_read(in, &(b->data[len]), want);
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125 | if ((i < 0) && ((len - off) == 0)) {
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126 | ASN1err(ASN1_F_ASN1_D2I_READ_BIO, ASN1_R_NOT_ENOUGH_DATA);
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127 | goto err;
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128 | }
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129 | if (i > 0) {
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130 | if (len + i < len) {
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131 | ASN1err(ASN1_F_ASN1_D2I_READ_BIO, ASN1_R_TOO_LONG);
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132 | goto err;
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133 | }
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134 | len += i;
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135 | }
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136 | }
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137 | /* else data already loaded */
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138 |
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139 | p = (unsigned char *)&(b->data[off]);
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140 | q = p;
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141 | inf = ASN1_get_object(&q, &slen, &tag, &xclass, len - off);
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142 | if (inf & 0x80) {
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143 | unsigned long e;
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144 |
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145 | e = ERR_GET_REASON(ERR_peek_error());
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146 | if (e != ASN1_R_TOO_LONG)
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147 | goto err;
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148 | else
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149 | ERR_clear_error(); /* clear error */
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150 | }
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151 | i = q - p; /* header length */
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152 | off += i; /* end of data */
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153 |
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154 | if (inf & 1) {
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155 | /* no data body so go round again */
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156 | if (eos == UINT32_MAX) {
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157 | ASN1err(ASN1_F_ASN1_D2I_READ_BIO, ASN1_R_HEADER_TOO_LONG);
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158 | goto err;
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159 | }
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160 | eos++;
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161 | want = HEADER_SIZE;
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162 | } else if (eos && (slen == 0) && (tag == V_ASN1_EOC)) {
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163 | /* eos value, so go back and read another header */
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164 | eos--;
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165 | if (eos == 0)
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166 | break;
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167 | else
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168 | want = HEADER_SIZE;
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169 | } else {
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170 | /* suck in slen bytes of data */
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171 | want = slen;
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172 | if (want > (len - off)) {
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173 | size_t chunk_max = ASN1_CHUNK_INITIAL_SIZE;
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174 |
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175 | want -= (len - off);
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176 | if (want > INT_MAX /* BIO_read takes an int length */ ||
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177 | len + want < len) {
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178 | ASN1err(ASN1_F_ASN1_D2I_READ_BIO, ASN1_R_TOO_LONG);
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179 | goto err;
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180 | }
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181 | while (want > 0) {
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182 | /*
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183 | * Read content in chunks of increasing size
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184 | * so we can return an error for EOF without
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185 | * having to allocate the entire content length
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186 | * in one go.
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187 | */
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188 | size_t chunk = want > chunk_max ? chunk_max : want;
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189 |
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190 | if (!BUF_MEM_grow_clean(b, len + chunk)) {
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191 | ASN1err(ASN1_F_ASN1_D2I_READ_BIO, ERR_R_MALLOC_FAILURE);
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192 | goto err;
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193 | }
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194 | want -= chunk;
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195 | while (chunk > 0) {
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196 | i = BIO_read(in, &(b->data[len]), chunk);
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197 | if (i <= 0) {
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198 | ASN1err(ASN1_F_ASN1_D2I_READ_BIO,
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199 | ASN1_R_NOT_ENOUGH_DATA);
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200 | goto err;
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201 | }
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202 | /*
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203 | * This can't overflow because |len+want| didn't
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204 | * overflow.
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205 | */
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206 | len += i;
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207 | chunk -= i;
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208 | }
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209 | if (chunk_max < INT_MAX/2)
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210 | chunk_max *= 2;
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211 | }
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212 | }
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213 | if (off + slen < off) {
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214 | ASN1err(ASN1_F_ASN1_D2I_READ_BIO, ASN1_R_TOO_LONG);
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215 | goto err;
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216 | }
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217 | off += slen;
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218 | if (eos == 0) {
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219 | break;
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220 | } else
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221 | want = HEADER_SIZE;
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222 | }
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223 | }
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224 |
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225 | if (off > INT_MAX) {
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226 | ASN1err(ASN1_F_ASN1_D2I_READ_BIO, ASN1_R_TOO_LONG);
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227 | goto err;
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228 | }
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229 |
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230 | *pb = b;
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231 | return off;
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232 | err:
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233 | BUF_MEM_free(b);
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234 | return -1;
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235 | }
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