Bug Summary

File:src/lib/libcrypto/asn1/a_int.c
Warning:line 505, column 16
Array access (from variable 's') results in a null pointer dereference

Annotated Source Code

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clang -cc1 -cc1 -triple amd64-unknown-openbsd7.4 -analyze -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name a_int.c -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model pic -pic-level 1 -pic-is-pie -mframe-pointer=all -relaxed-aliasing -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -target-feature +retpoline-indirect-calls -target-feature +retpoline-indirect-branches -tune-cpu generic -debugger-tuning=gdb -fcoverage-compilation-dir=/usr/src/lib/libcrypto/obj -resource-dir /usr/local/llvm16/lib/clang/16 -D LIBRESSL_INTERNAL -D HAVE_FUNOPEN -I /usr/src/lib/libcrypto -I /usr/src/lib/libcrypto/arch/amd64 -I /usr/src/lib/libcrypto/asn1 -I /usr/src/lib/libcrypto/bio -I /usr/src/lib/libcrypto/bn -I /usr/src/lib/libcrypto/bn/arch/amd64 -I /usr/src/lib/libcrypto/bytestring -I /usr/src/lib/libcrypto/curve25519 -I /usr/src/lib/libcrypto/dh -I /usr/src/lib/libcrypto/dsa -I /usr/src/lib/libcrypto/ec -I /usr/src/lib/libcrypto/ecdsa -I /usr/src/lib/libcrypto/evp -I /usr/src/lib/libcrypto/hidden -I /usr/src/lib/libcrypto/hmac -I /usr/src/lib/libcrypto/kdf -I /usr/src/lib/libcrypto/modes -I /usr/src/lib/libcrypto/ocsp -I /usr/src/lib/libcrypto/pkcs12 -I /usr/src/lib/libcrypto/rsa -I /usr/src/lib/libcrypto/sha -I /usr/src/lib/libcrypto/ts -I /usr/src/lib/libcrypto/x509 -I /usr/src/lib/libcrypto/obj -D AES_ASM -D BSAES_ASM -D VPAES_ASM -D OPENSSL_IA32_SSE2 -D RSA_ASM -D OPENSSL_BN_ASM_MONT -D OPENSSL_BN_ASM_MONT5 -D MD5_ASM -D GHASH_ASM -D RC4_MD5_ASM -D SHA1_ASM -D SHA256_ASM -D SHA512_ASM -D WHIRLPOOL_ASM -D OPENSSL_CPUID_OBJ -internal-isystem /usr/local/llvm16/lib/clang/16/include -internal-externc-isystem /usr/include -O2 -fdebug-compilation-dir=/usr/src/lib/libcrypto/obj -ferror-limit 19 -fwrapv -D_RET_PROTECTOR -ret-protector -fcf-protection=branch -fno-jump-tables -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-valloc -fno-builtin-free -fno-builtin-strdup -fno-builtin-strndup -analyzer-output=html -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /home/ben/Projects/scan/2024-01-11-140451-98009-1 -x c /usr/src/lib/libcrypto/asn1/a_int.c
1/* $OpenBSD: a_int.c,v 1.47 2023/07/05 21:23:36 beck Exp $ */
2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58
59#include <limits.h>
60#include <stdio.h>
61#include <string.h>
62
63#include <openssl/asn1.h>
64#include <openssl/asn1t.h>
65#include <openssl/bn.h>
66#include <openssl/buffer.h>
67#include <openssl/err.h>
68
69#include "bytestring.h"
70
71const ASN1_ITEM ASN1_INTEGER_it = {
72 .itype = ASN1_ITYPE_PRIMITIVE0x0,
73 .utype = V_ASN1_INTEGER2,
74 .sname = "ASN1_INTEGER",
75};
76
77ASN1_INTEGER *
78ASN1_INTEGER_new(void)
79{
80 return (ASN1_INTEGER *)ASN1_item_new(&ASN1_INTEGER_it);
81}
82LCRYPTO_ALIAS(ASN1_INTEGER_new)asm("");
83
84static void
85asn1_aint_clear(ASN1_INTEGER *aint)
86{
87 freezero(aint->data, aint->length);
88
89 memset(aint, 0, sizeof(*aint));
90
91 aint->type = V_ASN1_INTEGER2;
92}
93
94void
95ASN1_INTEGER_free(ASN1_INTEGER *a)
96{
97 ASN1_item_free((ASN1_VALUE *)a, &ASN1_INTEGER_it);
98}
99LCRYPTO_ALIAS(ASN1_INTEGER_free)asm("");
100
101static int
102ASN1_INTEGER_valid(const ASN1_INTEGER *a)
103{
104 return (a != NULL((void *)0) && a->length >= 0);
105}
106
107ASN1_INTEGER *
108ASN1_INTEGER_dup(const ASN1_INTEGER *x)
109{
110 if (!ASN1_INTEGER_valid(x))
111 return NULL((void *)0);
112
113 return ASN1_STRING_dup(x);
114}
115LCRYPTO_ALIAS(ASN1_INTEGER_dup)asm("");
116
117int
118ASN1_INTEGER_cmp(const ASN1_INTEGER *a, const ASN1_INTEGER *b)
119{
120 int ret = 1;
121
122 /* Compare sign, then content. */
123 if ((a->type & V_ASN1_NEG0x100) == (b->type & V_ASN1_NEG0x100))
124 ret = ASN1_STRING_cmp(a, b);
125
126 if ((a->type & V_ASN1_NEG0x100) != 0)
127 return -ret;
128
129 return ret;
130}
131LCRYPTO_ALIAS(ASN1_INTEGER_cmp)asm("");
132
133int
134asn1_aint_get_uint64(CBS *cbs, uint64_t *out_val)
135{
136 uint64_t val = 0;
137 uint8_t u8;
138
139 *out_val = 0;
140
141 while (CBS_len(cbs) > 0) {
142 if (!CBS_get_u8(cbs, &u8))
143 return 0;
144 if (val > (UINT64_MAX0xffffffffffffffffULL >> 8)) {
145 ASN1error(ASN1_R_TOO_LARGE)ERR_put_error(13,(0xfff),(223),"/usr/src/lib/libcrypto/asn1/a_int.c"
,145);
146 return 0;
147 }
148 val = val << 8 | u8;
149 }
150
151 *out_val = val;
152
153 return 1;
154}
155
156int
157asn1_aint_set_uint64(uint64_t val, uint8_t **out_data, int *out_len)
158{
159 uint8_t *data = NULL((void *)0);
160 size_t data_len = 0;
161 int started = 0;
162 uint8_t u8;
163 CBB cbb;
164 int i;
165 int ret = 0;
166
167 if (!CBB_init(&cbb, sizeof(long)))
168 goto err;
169
170 if (out_data == NULL((void *)0) || out_len == NULL((void *)0))
171 goto err;
172 if (*out_data != NULL((void *)0) || *out_len != 0)
173 goto err;
174
175 for (i = sizeof(uint64_t) - 1; i >= 0; i--) {
176 u8 = (val >> (i * 8)) & 0xff;
177 if (!started && i != 0 && u8 == 0)
178 continue;
179 if (!CBB_add_u8(&cbb, u8))
180 goto err;
181 started = 1;
182 }
183
184 if (!CBB_finish(&cbb, &data, &data_len))
185 goto err;
186 if (data_len > INT_MAX0x7fffffff)
187 goto err;
188
189 *out_data = data;
190 *out_len = (int)data_len;
191 data = NULL((void *)0);
192
193 ret = 1;
194 err:
195 CBB_cleanup(&cbb);
196 freezero(data, data_len);
197
198 return ret;
199}
200
201int
202asn1_aint_get_int64(CBS *cbs, int negative, int64_t *out_val)
203{
204 uint64_t val;
205
206 if (!asn1_aint_get_uint64(cbs, &val))
207 return 0;
208
209 if (negative) {
210 if (val > (uint64_t)INT64_MIN(-0x7fffffffffffffffLL - 1)) {
211 ASN1error(ASN1_R_TOO_SMALL)ERR_put_error(13,(0xfff),(224),"/usr/src/lib/libcrypto/asn1/a_int.c"
,211);
212 return 0;
213 }
214 *out_val = (int64_t)-val;
215 } else {
216 if (val > (uint64_t)INT64_MAX0x7fffffffffffffffLL) {
217 ASN1error(ASN1_R_TOO_LARGE)ERR_put_error(13,(0xfff),(223),"/usr/src/lib/libcrypto/asn1/a_int.c"
,217);
218 return 0;
219 }
220 *out_val = (int64_t)val;
221 }
222
223 return 1;
224}
225
226int
227ASN1_INTEGER_get_uint64(uint64_t *out_val, const ASN1_INTEGER *aint)
228{
229 uint64_t val;
230 CBS cbs;
231
232 *out_val = 0;
233
234 if (aint == NULL((void *)0) || aint->length < 0)
235 return 0;
236
237 if (aint->type == V_ASN1_NEG_INTEGER(2 | 0x100)) {
238 ASN1error(ASN1_R_ILLEGAL_NEGATIVE_VALUE)ERR_put_error(13,(0xfff),(226),"/usr/src/lib/libcrypto/asn1/a_int.c"
,238);
239 return 0;
240 }
241 if (aint->type != V_ASN1_INTEGER2) {
242 ASN1error(ASN1_R_WRONG_INTEGER_TYPE)ERR_put_error(13,(0xfff),(225),"/usr/src/lib/libcrypto/asn1/a_int.c"
,242);
243 return 0;
244 }
245
246 CBS_init(&cbs, aint->data, aint->length);
247
248 if (!asn1_aint_get_uint64(&cbs, &val))
249 return 0;
250
251 *out_val = val;
252
253 return 1;
254}
255LCRYPTO_ALIAS(ASN1_INTEGER_get_uint64)asm("");
256
257int
258ASN1_INTEGER_set_uint64(ASN1_INTEGER *aint, uint64_t val)
259{
260 asn1_aint_clear(aint);
261
262 return asn1_aint_set_uint64(val, &aint->data, &aint->length);
263}
264LCRYPTO_ALIAS(ASN1_INTEGER_set_uint64)asm("");
265
266int
267ASN1_INTEGER_get_int64(int64_t *out_val, const ASN1_INTEGER *aint)
268{
269 CBS cbs;
270
271 *out_val = 0;
272
273 if (aint == NULL((void *)0) || aint->length < 0)
274 return 0;
275
276 if (aint->type != V_ASN1_INTEGER2 &&
277 aint->type != V_ASN1_NEG_INTEGER(2 | 0x100)) {
278 ASN1error(ASN1_R_WRONG_INTEGER_TYPE)ERR_put_error(13,(0xfff),(225),"/usr/src/lib/libcrypto/asn1/a_int.c"
,278);
279 return 0;
280 }
281
282 CBS_init(&cbs, aint->data, aint->length);
283
284 return asn1_aint_get_int64(&cbs, (aint->type == V_ASN1_NEG_INTEGER(2 | 0x100)),
285 out_val);
286}
287LCRYPTO_ALIAS(ASN1_INTEGER_get_int64)asm("");
288
289int
290ASN1_INTEGER_set_int64(ASN1_INTEGER *aint, int64_t val)
291{
292 uint64_t uval;
293
294 asn1_aint_clear(aint);
295
296 uval = (uint64_t)val;
297
298 if (val < 0) {
299 aint->type = V_ASN1_NEG_INTEGER(2 | 0x100);
300 uval = -uval;
301 }
302
303 return asn1_aint_set_uint64(uval, &aint->data, &aint->length);
304}
305LCRYPTO_ALIAS(ASN1_INTEGER_set_int64)asm("");
306
307long
308ASN1_INTEGER_get(const ASN1_INTEGER *aint)
309{
310 int64_t val;
311
312 if (aint == NULL((void *)0))
313 return 0;
314 if (!ASN1_INTEGER_get_int64(&val, aint))
315 return -1;
316 if (val < LONG_MIN(-0x7fffffffffffffffL-1) || val > LONG_MAX0x7fffffffffffffffL) {
317 /* hmm... a bit ugly, return all ones */
318 return -1;
319 }
320
321 return (long)val;
322}
323LCRYPTO_ALIAS(ASN1_INTEGER_get)asm("");
324
325int
326ASN1_INTEGER_set(ASN1_INTEGER *aint, long val)
327{
328 return ASN1_INTEGER_set_int64(aint, val);
329}
330LCRYPTO_ALIAS(ASN1_INTEGER_set)asm("");
331
332ASN1_INTEGER *
333BN_to_ASN1_INTEGER(const BIGNUM *bn, ASN1_INTEGER *ai)
334{
335 ASN1_INTEGER *ret;
336 int len, j;
337
338 if (ai == NULL((void *)0))
339 ret = ASN1_INTEGER_new();
340 else
341 ret = ai;
342 if (ret == NULL((void *)0)) {
343 ASN1error(ERR_R_NESTED_ASN1_ERROR)ERR_put_error(13,(0xfff),(58),"/usr/src/lib/libcrypto/asn1/a_int.c"
,343);
344 goto err;
345 }
346
347 if (!ASN1_INTEGER_valid(ret))
348 goto err;
349
350 if (BN_is_negative(bn))
351 ret->type = V_ASN1_NEG_INTEGER(2 | 0x100);
352 else
353 ret->type = V_ASN1_INTEGER2;
354 j = BN_num_bits(bn);
355 len = ((j == 0) ? 0 : ((j / 8) + 1));
356 if (ret->length < len + 4) {
357 unsigned char *new_data = realloc(ret->data, len + 4);
358 if (!new_data) {
359 ASN1error(ERR_R_MALLOC_FAILURE)ERR_put_error(13,(0xfff),((1|64)),"/usr/src/lib/libcrypto/asn1/a_int.c"
,359);
360 goto err;
361 }
362 ret->data = new_data;
363 }
364 ret->length = BN_bn2bin(bn, ret->data);
365
366 /* Correct zero case */
367 if (!ret->length) {
368 ret->data[0] = 0;
369 ret->length = 1;
370 }
371 return (ret);
372
373 err:
374 if (ret != ai)
375 ASN1_INTEGER_free(ret);
376 return (NULL((void *)0));
377}
378LCRYPTO_ALIAS(BN_to_ASN1_INTEGER)asm("");
379
380BIGNUM *
381ASN1_INTEGER_to_BN(const ASN1_INTEGER *ai, BIGNUM *bn)
382{
383 BIGNUM *ret;
384
385 if (!ASN1_INTEGER_valid(ai))
386 return (NULL((void *)0));
387
388 if ((ret = BN_bin2bn(ai->data, ai->length, bn)) == NULL((void *)0))
389 ASN1error(ASN1_R_BN_LIB)ERR_put_error(13,(0xfff),(105),"/usr/src/lib/libcrypto/asn1/a_int.c"
,389);
390 else if (ai->type == V_ASN1_NEG_INTEGER(2 | 0x100))
391 BN_set_negative(ret, 1);
392 return (ret);
393}
394LCRYPTO_ALIAS(ASN1_INTEGER_to_BN)asm("");
395
396int
397i2a_ASN1_INTEGER(BIO *bp, const ASN1_INTEGER *a)
398{
399 int i, n = 0;
400 static const char h[] = "0123456789ABCDEF";
401 char buf[2];
402
403 if (a == NULL((void *)0))
404 return (0);
405
406 if (a->type & V_ASN1_NEG0x100) {
407 if (BIO_write(bp, "-", 1) != 1)
408 goto err;
409 n = 1;
410 }
411
412 if (a->length == 0) {
413 if (BIO_write(bp, "00", 2) != 2)
414 goto err;
415 n += 2;
416 } else {
417 for (i = 0; i < a->length; i++) {
418 if ((i != 0) && (i % 35 == 0)) {
419 if (BIO_write(bp, "\\\n", 2) != 2)
420 goto err;
421 n += 2;
422 }
423 buf[0] = h[((unsigned char)a->data[i] >> 4) & 0x0f];
424 buf[1] = h[((unsigned char)a->data[i]) & 0x0f];
425 if (BIO_write(bp, buf, 2) != 2)
426 goto err;
427 n += 2;
428 }
429 }
430 return (n);
431
432 err:
433 return (-1);
434}
435LCRYPTO_ALIAS(i2a_ASN1_INTEGER)asm("");
436
437int
438a2i_ASN1_INTEGER(BIO *bp, ASN1_INTEGER *bs, char *buf, int size)
439{
440 int ret = 0;
441 int i, j,k, m,n, again, bufsize;
442 unsigned char *s = NULL((void *)0), *sp;
1
's' initialized to a null pointer value
→
443 unsigned char *bufp;
444 int num = 0, slen = 0, first = 1;
445
446 bs->type = V_ASN1_INTEGER2;
447
448 bufsize = BIO_gets(bp, buf, size);
449 for (;;) {
2
←
Loop condition is true. Entering loop body
→
23
←
Loop condition is true. Entering loop body
→
450 if (bufsize < 1)
3
←
Assuming 'bufsize' is >= 1
→
4
←
Taking false branch
→
24
←
Assuming 'bufsize' is >= 1
→
25
←
Taking false branch
→
451 goto err_sl;
452 i = bufsize;
453 if (buf[i - 1] == '\n')
5
←
Assuming the condition is false
→
6
←
Taking false branch
→
26
←
Assuming the condition is false
→
27
←
Taking false branch
→
454 buf[--i] = '\0';
455 if (i
6.1
'i' is not equal to 0
27.1
'i' is not equal to 0
 == 0)
7
←
Taking false branch
→
28
←
Taking false branch
→
456 goto err_sl;
457 if (buf[i - 1] == '\r')
8
←
Assuming the condition is false
→
9
←
Taking false branch
→
29
←
Assuming the condition is false
→
30
←
Taking false branch
→
458 buf[--i] = '\0';
459 if (i
9.1
'i' is not equal to 0
30.1
'i' is not equal to 0
 == 0)
10
←
Taking false branch
→
31
←
Taking false branch
→
460 goto err_sl;
461 if (buf[i - 1] == '\\') {
11
←
Assuming the condition is true
→
12
←
Taking true branch
→
32
←
Assuming the condition is false
→
33
←
Taking false branch
→
462 i--;
463 again = 1;
464 } else
465 again = 0;
466 buf[i] = '\0';
467 if (i < 2)
13
←
Assuming 'i' is >= 2
→
14
←
Taking false branch
→
34
←
Assuming 'i' is >= 2
→
35
←
Taking false branch
→
468 goto err_sl;
469
470 bufp = (unsigned char *)buf;
471 if (first
14.1
'first' is 1
35.1
'first' is 0
) {
15
←
Taking true branch
→
36
←
Taking false branch
→
472 first = 0;
473 if ((bufp[0] == '0') && (buf[1] == '0')) {
16
←
Assuming the condition is false
→
474 bufp += 2;
475 i -= 2;
476 }
477 }
478 k = 0;
479 if (i % 2 != 0) {
17
←
Assuming the condition is false
→
18
←
Taking false branch
→
37
←
Assuming the condition is false
→
38
←
Taking false branch
→
480 ASN1error(ASN1_R_ODD_NUMBER_OF_CHARS)ERR_put_error(13,(0xfff),(145),"/usr/src/lib/libcrypto/asn1/a_int.c"
,480);
481 goto err;
482 }
483 i /= 2;
484 if (num + i > slen) {
19
←
Assuming the condition is false
→
20
←
Taking false branch
→
39
←
Assuming the condition is false
→
40
←
Taking false branch
→
485 if ((sp = recallocarray(s, slen, num + i, 1)) == NULL((void *)0)) {
486 ASN1error(ERR_R_MALLOC_FAILURE)ERR_put_error(13,(0xfff),((1|64)),"/usr/src/lib/libcrypto/asn1/a_int.c"
,486);
487 goto err;
488 }
489 s = sp;
490 slen = num + i;
491 }
492 for (j = 0; j
20.1
'j' is >= 'i'
 < i; j++, k += 2) {
21
←
Loop condition is false. Execution continues on line 509
→
41
←
Assuming 'j' is < 'i'
→
42
←
Loop condition is true. Entering loop body
→
493 for (n = 0; n < 2; n++) {
43
←
Loop condition is true. Entering loop body
→
494 m = bufp[k + n];
495 if ((m >= '0') && (m <= '9'))
44
←
Assuming the condition is true
→
45
←
Assuming the condition is true
→
46
←
Taking true branch
→
496 m -= '0';
497 else if ((m >= 'a') && (m <= 'f'))
498 m = m - 'a' + 10;
499 else if ((m >= 'A') && (m <= 'F'))
500 m = m - 'A' + 10;
501 else {
502 ASN1error(ASN1_R_NON_HEX_CHARACTERS)ERR_put_error(13,(0xfff),(141),"/usr/src/lib/libcrypto/asn1/a_int.c"
,502);
503 goto err;
504 }
505 s[num + j] <<= 4;
47
←
Array access (from variable 's') results in a null pointer dereference
506 s[num + j] |= m;
507 }
508 }
509 num += i;
510 if (again
21.1
'again' is 1
)
22
←
Taking true branch
→
511 bufsize = BIO_gets(bp, buf, size);
512 else
513 break;
514 }
515 bs->length = num;
516 bs->data = s;
517 return (1);
518
519 err_sl:
520 ASN1error(ASN1_R_SHORT_LINE)ERR_put_error(13,(0xfff),(150),"/usr/src/lib/libcrypto/asn1/a_int.c"
,520);
521 err:
522 free(s);
523 return (ret);
524}
525LCRYPTO_ALIAS(a2i_ASN1_INTEGER)asm("");
526
527static void
528asn1_aint_twos_complement(uint8_t *data, size_t data_len)
529{
530 uint8_t carry = 1;
531 ssize_t i;
532
533 for (i = data_len - 1; i >= 0; i--) {
534 data[i] = (data[i] ^ 0xff) + carry;
535 if (data[i] != 0)
536 carry = 0;
537 }
538}
539
540static int
541asn1_aint_keep_twos_padding(const uint8_t *data, size_t data_len)
542{
543 size_t i;
544
545 /*
546 * If a two's complement value has a padding byte (0xff) and the rest
547 * of the value is all zeros, the padding byte cannot be removed as when
548 * converted from two's complement this becomes 0x01 (in the place of
549 * the padding byte) followed by the same number of zero bytes.
550 */
551 if (data_len <= 1 || data[0] != 0xff)
552 return 0;
553 for (i = 1; i < data_len; i++) {
554 if (data[i] != 0)
555 return 0;
556 }
557 return 1;
558}
559
560static int
561i2c_ASN1_INTEGER_cbb(ASN1_INTEGER *aint, CBB *cbb)
562{
563 uint8_t *data = NULL((void *)0);
564 size_t data_len = 0;
565 uint8_t padding, val;
566 uint8_t msb;
567 CBS cbs;
568 int ret = 0;
569
570 if (aint->length < 0)
571 goto err;
572 if (aint->data == NULL((void *)0) && aint->length != 0)
573 goto err;
574
575 if ((aint->type & ~V_ASN1_NEG0x100) != V_ASN1_ENUMERATED10 &&
576 (aint->type & ~V_ASN1_NEG0x100) != V_ASN1_INTEGER2)
577 goto err;
578
579 CBS_init(&cbs, aint->data, aint->length);
580
581 /* Find the first non-zero byte. */
582 while (CBS_len(&cbs) > 0) {
583 if (!CBS_peek_u8(&cbs, &val))
584 goto err;
585 if (val != 0)
586 break;
587 if (!CBS_skip(&cbs, 1))
588 goto err;
589 }
590
591 /* A zero value is encoded as a single octet. */
592 if (CBS_len(&cbs) == 0) {
593 if (!CBB_add_u8(cbb, 0))
594 goto err;
595 goto done;
596 }
597
598 if (!CBS_stow(&cbs, &data, &data_len))
599 goto err;
600
601 if ((aint->type & V_ASN1_NEG0x100) != 0)
602 asn1_aint_twos_complement(data, data_len);
603
604 /* Topmost bit indicates sign, padding is all zeros or all ones. */
605 msb = (data[0] >> 7);
606 padding = (msb - 1) & 0xff;
607
608 /* See if we need a padding octet to avoid incorrect sign. */
609 if (((aint->type & V_ASN1_NEG0x100) == 0 && msb == 1) ||
610 ((aint->type & V_ASN1_NEG0x100) != 0 && msb == 0)) {
611 if (!CBB_add_u8(cbb, padding))
612 goto err;
613 }
614 if (!CBB_add_bytes(cbb, data, data_len))
615 goto err;
616
617 done:
618 ret = 1;
619
620 err:
621 freezero(data, data_len);
622
623 return ret;
624}
625
626int
627i2c_ASN1_INTEGER(ASN1_INTEGER *aint, unsigned char **pp)
628{
629 uint8_t *data = NULL((void *)0);
630 size_t data_len = 0;
631 CBB cbb;
632 int ret = -3;
633
634 if (!CBB_init(&cbb, 0))
635 goto err;
636 if (!i2c_ASN1_INTEGER_cbb(aint, &cbb))
637 goto err;
638 if (!CBB_finish(&cbb, &data, &data_len))
639 goto err;
640 if (data_len > INT_MAX0x7fffffff)
641 goto err;
642
643 if (pp != NULL((void *)0)) {
644 if ((uintptr_t)*pp > UINTPTR_MAX0xffffffffffffffffUL - data_len)
645 goto err;
646 memcpy(*pp, data, data_len);
647 *pp += data_len;
648 }
649
650 ret = data_len;
651
652 err:
653 freezero(data, data_len);
654 CBB_cleanup(&cbb);
655
656 return ret;
657}
658
659int
660c2i_ASN1_INTEGER_cbs(ASN1_INTEGER **out_aint, CBS *cbs)
661{
662 ASN1_INTEGER *aint = NULL((void *)0);
663 uint8_t *data = NULL((void *)0);
664 size_t data_len = 0;
665 uint8_t padding, val;
666 uint8_t negative;
667 int ret = 0;
668
669 if (out_aint == NULL((void *)0))
670 goto err;
671
672 if (*out_aint != NULL((void *)0)) {
673 ASN1_INTEGER_free(*out_aint);
674 *out_aint = NULL((void *)0);
675 }
676
677 if (CBS_len(cbs) == 0) {
678 /* XXX INVALID ENCODING? */
679 ASN1error(ERR_R_ASN1_LENGTH_MISMATCH)ERR_put_error(13,(0xfff),(62),"/usr/src/lib/libcrypto/asn1/a_int.c"
,679);
680 goto err;
681 }
682 if (!CBS_peek_u8(cbs, &val))
683 goto err;
684
685 /* Topmost bit indicates sign, padding is all zeros or all ones. */
686 negative = (val >> 7);
687 padding = ~(negative - 1) & 0xff;
688
689 /*
690 * Ensure that the first 9 bits are not all zero or all one, as per
691 * X.690 section 8.3.2. Remove the padding octet if possible.
692 */
693 if (CBS_len(cbs) > 1 && val == padding) {
694 if (!asn1_aint_keep_twos_padding(CBS_data(cbs), CBS_len(cbs))) {
695 if (!CBS_get_u8(cbs, &padding))
696 goto err;
697 if (!CBS_peek_u8(cbs, &val))
698 goto err;
699 if ((val >> 7) == (padding >> 7)) {
700 /* XXX INVALID ENCODING? */
701 ASN1error(ERR_R_ASN1_LENGTH_MISMATCH)ERR_put_error(13,(0xfff),(62),"/usr/src/lib/libcrypto/asn1/a_int.c"
,701);
702 goto err;
703 }
704 }
705 }
706
707 if (!CBS_stow(cbs, &data, &data_len))
708 goto err;
709 if (data_len > INT_MAX0x7fffffff)
710 goto err;
711
712 if ((aint = ASN1_INTEGER_new()) == NULL((void *)0))
713 goto err;
714
715 /*
716 * Negative integers are handled as a separate type - convert from
717 * two's complement for internal representation.
718 */
719 if (negative) {
720 aint->type = V_ASN1_NEG_INTEGER(2 | 0x100);
721 asn1_aint_twos_complement(data, data_len);
722 }
723
724 aint->data = data;
725 aint->length = (int)data_len;
726 data = NULL((void *)0);
727
728 *out_aint = aint;
729 aint = NULL((void *)0);
730
731 ret = 1;
732
733 err:
734 ASN1_INTEGER_free(aint);
735 freezero(data, data_len);
736
737 return ret;
738}
739
740ASN1_INTEGER *
741c2i_ASN1_INTEGER(ASN1_INTEGER **out_aint, const unsigned char **pp, long len)
742{
743 ASN1_INTEGER *aint = NULL((void *)0);
744 CBS content;
745
746 if (out_aint != NULL((void *)0)) {
747 ASN1_INTEGER_free(*out_aint);
748 *out_aint = NULL((void *)0);
749 }
750
751 if (len < 0) {
752 ASN1error(ASN1_R_LENGTH_ERROR)ERR_put_error(13,(0xfff),(136),"/usr/src/lib/libcrypto/asn1/a_int.c"
,752);
753 return NULL((void *)0);
754 }
755
756 CBS_init(&content, *pp, len);
757
758 if (!c2i_ASN1_INTEGER_cbs(&aint, &content))
759 return NULL((void *)0);
760
761 *pp = CBS_data(&content);
762
763 if (out_aint != NULL((void *)0))
764 *out_aint = aint;
765
766 return aint;
767}
768
769int
770i2d_ASN1_INTEGER(ASN1_INTEGER *a, unsigned char **out)
771{
772 return ASN1_item_i2d((ASN1_VALUE *)a, out, &ASN1_INTEGER_it);
773}
774LCRYPTO_ALIAS(i2d_ASN1_INTEGER)asm("");
775
776ASN1_INTEGER *
777d2i_ASN1_INTEGER(ASN1_INTEGER **a, const unsigned char **in, long len)
778{
779 return (ASN1_INTEGER *)ASN1_item_d2i((ASN1_VALUE **)a, in, len,
780 &ASN1_INTEGER_it);
781}
782LCRYPTO_ALIAS(d2i_ASN1_INTEGER)asm("");
783
784/* This is a version of d2i_ASN1_INTEGER that ignores the sign bit of
785 * ASN1 integers: some broken software can encode a positive INTEGER
786 * with its MSB set as negative (it doesn't add a padding zero).
787 */
788
789ASN1_INTEGER *
790d2i_ASN1_UINTEGER(ASN1_INTEGER **a, const unsigned char **pp, long length)
791{
792 ASN1_INTEGER *ret = NULL((void *)0);
793 const unsigned char *p;
794 unsigned char *s;
795 long len;
796 int inf, tag, xclass;
797 int i;
798
799 if ((a == NULL((void *)0)) || ((*a) == NULL((void *)0))) {
800 if ((ret = ASN1_INTEGER_new()) == NULL((void *)0))
801 return (NULL((void *)0));
802 } else
803 ret = (*a);
804
805 if (!ASN1_INTEGER_valid(ret)) {
806 i = ERR_R_ASN1_LENGTH_MISMATCH62;
807 goto err;
808 }
809
810 p = *pp;
811 inf = ASN1_get_object(&p, &len, &tag, &xclass, length);
812 if (inf & 0x80) {
813 i = ASN1_R_BAD_OBJECT_HEADER102;
814 goto err;
815 }
816
817 if (tag != V_ASN1_INTEGER2) {
818 i = ASN1_R_EXPECTING_AN_INTEGER115;
819 goto err;
820 }
821
822 /* We must malloc stuff, even for 0 bytes otherwise it
823 * signifies a missing NULL parameter. */
824 if (len < 0 || len > INT_MAX0x7fffffff) {
825 i = ERR_R_ASN1_LENGTH_MISMATCH62;
826 goto err;
827 }
828 s = malloc(len + 1);
829 if (s == NULL((void *)0)) {
830 i = ERR_R_MALLOC_FAILURE(1|64);
831 goto err;
832 }
833 ret->type = V_ASN1_INTEGER2;
834 if (len) {
835 if ((*p == 0) && (len != 1)) {
836 p++;
837 len--;
838 }
839 memcpy(s, p, len);
840 p += len;
841 }
842
843 free(ret->data);
844 ret->data = s;
845 ret->length = (int)len;
846 if (a != NULL((void *)0))
847 (*a) = ret;
848 *pp = p;
849 return (ret);
850
851 err:
852 ASN1error(i)ERR_put_error(13,(0xfff),(i),"/usr/src/lib/libcrypto/asn1/a_int.c"
,852);
853 if (a == NULL((void *)0) || *a != ret)
854 ASN1_INTEGER_free(ret);
855 return (NULL((void *)0));
856}
857LCRYPTO_ALIAS(d2i_ASN1_UINTEGER)asm("");