Bug Summary

File:src/lib/libcrypto/asn1/a_object.c
Warning:line 257, column 15
Assigned value is garbage or undefined

Annotated Source Code

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clang -cc1 -cc1 -triple amd64-unknown-openbsd7.0 -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name a_object.c -analyzer-store=region -analyzer-opt-analyze-nested-blocks -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 -fhalf-no-semantic-interposition -mframe-pointer=all -relaxed-aliasing -fno-rounding-math -mconstructor-aliases -munwind-tables -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/lib/clang/13.0.0 -D LIBRESSL_INTERNAL -D LIBRESSL_CRYPTO_INTERNAL -D DSO_DLFCN -D HAVE_DLFCN_H -D HAVE_FUNOPEN -D OPENSSL_NO_HW_PADLOCK -I /usr/src/lib/libcrypto -I /usr/src/lib/libcrypto/asn1 -I /usr/src/lib/libcrypto/bio -I /usr/src/lib/libcrypto/bn -I /usr/src/lib/libcrypto/bytestring -I /usr/src/lib/libcrypto/dh -I /usr/src/lib/libcrypto/dsa -I /usr/src/lib/libcrypto/ec -I /usr/src/lib/libcrypto/ecdh -I /usr/src/lib/libcrypto/ecdsa -I /usr/src/lib/libcrypto/evp -I /usr/src/lib/libcrypto/hmac -I /usr/src/lib/libcrypto/modes -I /usr/src/lib/libcrypto/ocsp -I /usr/src/lib/libcrypto/rsa -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 OPENSSL_BN_ASM_GF2m -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 -D PIC -internal-isystem /usr/local/lib/clang/13.0.0/include -internal-externc-isystem /usr/include -O2 -fdebug-compilation-dir=/usr/src/lib/libcrypto/obj -ferror-limit 19 -fwrapv -D_RET_PROTECTOR -ret-protector -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/vmm/scan-build/2022-01-12-194120-40624-1 -x c /usr/src/lib/libcrypto/asn1/a_object.c
1/* $OpenBSD: a_object.c,v 1.37 2022/01/07 11:13:54 tb 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/err.h>
67#include <openssl/buffer.h>
68#include <openssl/objects.h>
69
70#include "asn1_locl.h"
71
72const ASN1_ITEM ASN1_OBJECT_it = {
73 .itype = ASN1_ITYPE_PRIMITIVE0x0,
74 .utype = V_ASN1_OBJECT6,
75 .sname = "ASN1_OBJECT",
76};
77
78ASN1_OBJECT *
79ASN1_OBJECT_new(void)
80{
81 ASN1_OBJECT *a;
82
83 if ((a = calloc(1, sizeof(ASN1_OBJECT))) == NULL((void*)0)) {
84 ASN1error(ERR_R_MALLOC_FAILURE)ERR_put_error(13,(0xfff),((1|64)),"/usr/src/lib/libcrypto/asn1/a_object.c"
,84);
85 return (NULL((void*)0));
86 }
87 a->flags = ASN1_OBJECT_FLAG_DYNAMIC0x01;
88
89 return a;
90}
91
92void
93ASN1_OBJECT_free(ASN1_OBJECT *a)
94{
95 if (a == NULL((void*)0))
96 return;
97 if (a->flags & ASN1_OBJECT_FLAG_DYNAMIC_STRINGS0x04) {
98 free((void *)a->sn);
99 free((void *)a->ln);
100 a->sn = a->ln = NULL((void*)0);
101 }
102 if (a->flags & ASN1_OBJECT_FLAG_DYNAMIC_DATA0x08) {
103 freezero((void *)a->data, a->length);
104 a->data = NULL((void*)0);
105 a->length = 0;
106 }
107 if (a->flags & ASN1_OBJECT_FLAG_DYNAMIC0x01)
108 free(a);
109}
110
111ASN1_OBJECT *
112ASN1_OBJECT_create(int nid, unsigned char *data, int len,
113 const char *sn, const char *ln)
114{
115 ASN1_OBJECT o;
116
117 o.sn = sn;
118 o.ln = ln;
119 o.data = data;
120 o.nid = nid;
121 o.length = len;
122 o.flags = ASN1_OBJECT_FLAG_DYNAMIC0x01 | ASN1_OBJECT_FLAG_DYNAMIC_STRINGS0x04 |
123 ASN1_OBJECT_FLAG_DYNAMIC_DATA0x08;
124 return (OBJ_dup(&o));
125}
126
127int
128i2d_ASN1_OBJECT(const ASN1_OBJECT *a, unsigned char **pp)
129{
130 unsigned char *p;
131 int objsize;
132
133 if ((a == NULL((void*)0)) || (a->data == NULL((void*)0)))
134 return (0);
135
136 objsize = ASN1_object_size(0, a->length, V_ASN1_OBJECT6);
137 if (pp == NULL((void*)0))
138 return objsize;
139
140 p = *pp;
141 ASN1_put_object(&p, 0, a->length, V_ASN1_OBJECT6, V_ASN1_UNIVERSAL0x00);
142 memcpy(p, a->data, a->length);
143 p += a->length;
144
145 *pp = p;
146 return (objsize);
147}
148
149int
150a2d_ASN1_OBJECT(unsigned char *out, int olen, const char *buf, int num)
151{
152 int i, first, len = 0, c, use_bn;
153 char ftmp[24], *tmp = ftmp;
154 int tmpsize = sizeof ftmp;
155 const char *p;
156 unsigned long l;
157 BIGNUM *bl = NULL((void*)0);
158
159 if (num == 0)
1
Assuming 'num' is not equal to 0
→
2
←
Taking false branch
→
160 return (0);
161 else if (num == -1)
3
←
Assuming the condition is false
→
4
←
Taking false branch
→
162 num = strlen(buf);
163
164 p = buf;
165 c = *(p++);
166 num--;
167 if ((c >= '0') && (c <= '2')) {
5
←
Assuming the condition is true
→
6
←
Assuming the condition is true
→
7
←
Taking true branch
→
168 first= c-'0';
169 } else {
170 ASN1error(ASN1_R_FIRST_NUM_TOO_LARGE)ERR_put_error(13,(0xfff),(122),"/usr/src/lib/libcrypto/asn1/a_object.c"
,170);
171 goto err;
172 }
173
174 if (num <= 0) {
8
←
Assuming 'num' is > 0
→
9
←
Taking false branch
→
175 ASN1error(ASN1_R_MISSING_SECOND_NUMBER)ERR_put_error(13,(0xfff),(138),"/usr/src/lib/libcrypto/asn1/a_object.c"
,175);
176 goto err;
177 }
178 c = *(p++);
179 num--;
180 for (;;) {
10
←
Loop condition is true. Entering loop body
→
181 if (num <= 0)
11
←
Assuming 'num' is > 0
→
12
←
Taking false branch
→
182 break;
183 if ((c != '.') && (c != ' ')) {
13
←
Assuming the condition is false
→
184 ASN1error(ASN1_R_INVALID_SEPARATOR)ERR_put_error(13,(0xfff),(131),"/usr/src/lib/libcrypto/asn1/a_object.c"
,184);
185 goto err;
186 }
187 l = 0;
188 use_bn = 0;
189 for (;;) {
14
←
Loop condition is true. Entering loop body
→
24
←
Loop condition is true. Entering loop body
→
35
←
Loop condition is true. Entering loop body
→
54
←
Loop condition is true. Entering loop body
→
190 if (num
14.1
'num' is > 0
 <= 0)
15
←
Taking false branch
→
25
←
Assuming 'num' is > 0
→
26
←
Taking false branch
→
36
←
Assuming 'num' is > 0
→
37
←
Taking false branch
→
55
←
Assuming 'num' is <= 0
→
56
←
Taking true branch
→
191 break;
57
←
 Execution continues on line 214
→
192 num--;
193 c = *(p++);
194 if ((c == ' ') || (c == '.'))
16
←
Assuming the condition is false
→
17
←
Assuming the condition is false
→
18
←
Taking false branch
→
27
←
Assuming the condition is false
→
28
←
Assuming the condition is false
→
29
←
Taking false branch
→
38
←
Assuming the condition is false
→
39
←
Assuming the condition is false
→
40
←
Taking false branch
→
195 break;
196 if ((c < '0') || (c > '9')) {
19
←
Assuming the condition is false
→
20
←
Assuming the condition is false
→
21
←
Taking false branch
→
30
←
Assuming the condition is false
→
31
←
Assuming the condition is false
→
32
←
Taking false branch
→
41
←
Assuming the condition is false
→
42
←
Assuming the condition is false
→
43
←
Taking false branch
→
197 ASN1error(ASN1_R_INVALID_DIGIT)ERR_put_error(13,(0xfff),(130),"/usr/src/lib/libcrypto/asn1/a_object.c"
,197);
198 goto err;
199 }
200 if (!use_bn
21.1
'use_bn' is 0
32.1
'use_bn' is 0
43.1
'use_bn' is 0
 && l >= ((ULONG_MAX(9223372036854775807L *2UL+1UL) - 80) / 10L)) {
22
←
Taking false branch
→
33
←
Taking false branch
→
44
←
Assuming the condition is true
→
45
←
Taking true branch
→
201 use_bn = 1;
202 if (!bl
45.1
'bl' is null
)
46
←
Taking true branch
→
203 bl = BN_new();
204 if (!bl || !BN_set_word(bl, l))
47
←
Assuming 'bl' is non-null
→
48
←
Assuming the condition is false
→
49
←
Taking false branch
→
205 goto err;
206 }
207 if (use_bn
22.1
'use_bn' is 0
33.1
'use_bn' is 0
49.1
'use_bn' is 1
) {
23
←
Taking false branch
→
34
←
Taking false branch
→
50
←
Taking true branch
→
208 if (!BN_mul_word(bl, 10L) ||
51
←
Assuming the condition is false
→
53
←
Taking false branch
→
209 !BN_add_word(bl, c-'0'))
52
←
Assuming the condition is false
→
210 goto err;
211 } else
212 l = l * 10L + (long)(c - '0');
213 }
214 if (len
57.1
'len' is equal to 0
 == 0) {
58
←
Taking true branch
→
215 if ((first < 2) && (l >= 40)) {
59
←
Assuming 'first' is >= 2
→
216 ASN1error(ASN1_R_SECOND_NUMBER_TOO_LARGE)ERR_put_error(13,(0xfff),(147),"/usr/src/lib/libcrypto/asn1/a_object.c"
,216);
217 goto err;
218 }
219 if (use_bn
59.1
'use_bn' is 1
) {
60
←
Taking true branch
→
220 if (!BN_add_word(bl, first * 40))
61
←
Assuming the condition is false
→
62
←
Taking false branch
→
221 goto err;
222 } else
223 l += (long)first * 40;
224 }
225 i = 0;
226 if (use_bn
62.1
'use_bn' is 1
) {
63
←
Taking true branch
→
227 int blsize;
228 blsize = BN_num_bits(bl);
229 blsize = (blsize + 6) / 7;
230 if (blsize > tmpsize) {
64
←
Assuming 'blsize' is <= 'tmpsize'
→
65
←
Taking false branch
→
231 if (tmp != ftmp)
232 free(tmp);
233 tmpsize = blsize + 32;
234 tmp = malloc(tmpsize);
235 if (!tmp)
236 goto err;
237 }
238 while (blsize--)
66
←
Loop condition is false. Execution continues on line 250
→
239 tmp[i++] = (unsigned char)BN_div_word(bl, 0x80L);
240 } else {
241
242 for (;;) {
243 tmp[i++] = (unsigned char)l & 0x7f;
244 l >>= 7L;
245 if (l == 0L)
246 break;
247 }
248
249 }
250 if (out != NULL((void*)0)) {
67
←
Assuming 'out' is not equal to NULL
→
68
←
Taking true branch
→
251 if (len + i > olen) {
69
←
Assuming the condition is false
→
70
←
Taking false branch
→
252 ASN1error(ASN1_R_BUFFER_TOO_SMALL)ERR_put_error(13,(0xfff),(107),"/usr/src/lib/libcrypto/asn1/a_object.c"
,252);
253 goto err;
254 }
255 while (--i > 0)
71
←
Loop condition is false. Execution continues on line 257
→
256 out[len++] = tmp[i]|0x80;
257 out[len++] = tmp[0];
72
←
Assigned value is garbage or undefined
258 } else
259 len += i;
260 }
261 if (tmp != ftmp)
262 free(tmp);
263 BN_free(bl);
264 return (len);
265
266 err:
267 if (tmp != ftmp)
268 free(tmp);
269 BN_free(bl);
270 return (0);
271}
272
273int
274i2t_ASN1_OBJECT(char *buf, int buf_len, const ASN1_OBJECT *a)
275{
276 return OBJ_obj2txt(buf, buf_len, a, 0);
277}
278
279int
280i2a_ASN1_OBJECT(BIO *bp, const ASN1_OBJECT *a)
281{
282 char *tmp = NULL((void*)0);
283 size_t tlen = 256;
284 int i = -1;
285
286 if ((a == NULL((void*)0)) || (a->data == NULL((void*)0)))
287 return(BIO_write(bp, "NULL", 4));
288 if ((tmp = malloc(tlen)) == NULL((void*)0))
289 return -1;
290 i = i2t_ASN1_OBJECT(tmp, tlen, a);
291 if (i > (int)(tlen - 1)) {
292 freezero(tmp, tlen);
293 if ((tmp = malloc(i + 1)) == NULL((void*)0))
294 return -1;
295 tlen = i + 1;
296 i = i2t_ASN1_OBJECT(tmp, tlen, a);
297 }
298 if (i <= 0)
299 i = BIO_write(bp, "<INVALID>", 9);
300 else
301 i = BIO_write(bp, tmp, i);
302 freezero(tmp, tlen);
303 return (i);
304}
305
306ASN1_OBJECT *
307d2i_ASN1_OBJECT(ASN1_OBJECT **a, const unsigned char **pp, long length)
308{
309 const unsigned char *p;
310 long len;
311 int tag, xclass;
312 int inf, i;
313 ASN1_OBJECT *ret = NULL((void*)0);
314
315 p = *pp;
316 inf = ASN1_get_object(&p, &len, &tag, &xclass, length);
317 if (inf & 0x80) {
318 i = ASN1_R_BAD_OBJECT_HEADER102;
319 goto err;
320 }
321
322 if (tag != V_ASN1_OBJECT6) {
323 i = ASN1_R_EXPECTING_AN_OBJECT116;
324 goto err;
325 }
326 ret = c2i_ASN1_OBJECT(a, &p, len);
327 if (ret)
328 *pp = p;
329 return ret;
330
331 err:
332 ASN1error(i)ERR_put_error(13,(0xfff),(i),"/usr/src/lib/libcrypto/asn1/a_object.c"
,332);
333 return (NULL((void*)0));
334}
335
336ASN1_OBJECT *
337c2i_ASN1_OBJECT(ASN1_OBJECT **a, const unsigned char **pp, long len)
338{
339 ASN1_OBJECT *ret;
340 const unsigned char *p;
341 unsigned char *data;
342 int i, length;
343
344 /*
345 * Sanity check OID encoding:
346 * - need at least one content octet
347 * - MSB must be clear in the last octet
348 * - can't have leading 0x80 in subidentifiers, see: X.690 8.19.2
349 */
350 if (len <= 0 || len > INT_MAX2147483647 || pp == NULL((void*)0) || (p = *pp) == NULL((void*)0) ||
351 p[len - 1] & 0x80) {
352 ASN1error(ASN1_R_INVALID_OBJECT_ENCODING)ERR_put_error(13,(0xfff),(216),"/usr/src/lib/libcrypto/asn1/a_object.c"
,352);
353 return (NULL((void*)0));
354 }
355
356 /* Now 0 < len <= INT_MAX, so the cast is safe. */
357 length = (int)len;
358 for (i = 0; i < length; i++, p++) {
359 if (*p == 0x80 && (!i || !(p[-1] & 0x80))) {
360 ASN1error(ASN1_R_INVALID_OBJECT_ENCODING)ERR_put_error(13,(0xfff),(216),"/usr/src/lib/libcrypto/asn1/a_object.c"
,360);
361 return (NULL((void*)0));
362 }
363 }
364
365 if ((a == NULL((void*)0)) || ((*a) == NULL((void*)0)) ||
366 !((*a)->flags & ASN1_OBJECT_FLAG_DYNAMIC0x01)) {
367 if ((ret = ASN1_OBJECT_new()) == NULL((void*)0))
368 return (NULL((void*)0));
369 } else
370 ret = *a;
371
372 p = *pp;
373
374 /* detach data from object */
375 data = (unsigned char *)ret->data;
376 freezero(data, ret->length);
377
378 data = malloc(length);
379 if (data == NULL((void*)0)) {
380 ASN1error(ERR_R_MALLOC_FAILURE)ERR_put_error(13,(0xfff),((1|64)),"/usr/src/lib/libcrypto/asn1/a_object.c"
,380);
381 goto err;
382 }
383
384 memcpy(data, p, length);
385
386 /* If there are dynamic strings, free them here, and clear the flag. */
387 if ((ret->flags & ASN1_OBJECT_FLAG_DYNAMIC_STRINGS0x04) != 0) {
388 free((void *)ret->sn);
389 free((void *)ret->ln);
390 ret->flags &= ~ASN1_OBJECT_FLAG_DYNAMIC_STRINGS0x04;
391 }
392
393 /* reattach data to object, after which it remains const */
394 ret->data = data;
395 ret->length = length;
396 ret->sn = NULL((void*)0);
397 ret->ln = NULL((void*)0);
398 ret->flags |= ASN1_OBJECT_FLAG_DYNAMIC_DATA0x08;
399 p += length;
400
401 if (a != NULL((void*)0))
402 *a = ret;
403 *pp = p;
404 return (ret);
405
406 err:
407 if (a == NULL((void*)0) || ret != *a)
408 ASN1_OBJECT_free(ret);
409 return (NULL((void*)0));
410}