Bug Summary

File:src/lib/libcrypto/asn1/a_enum.c
Warning:line 322, 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-openbsd7.0 -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name a_enum.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_enum.c
1/* $OpenBSD: a_enum.c,v 1.23 2021/12/25 13:17:48 jsing 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
62#include <openssl/asn1.h>
63#include <openssl/asn1t.h>
64#include <openssl/bn.h>
65#include <openssl/buffer.h>
66#include <openssl/err.h>
67
68/*
69 * Code for ENUMERATED type: identical to INTEGER apart from a different tag.
70 * for comments on encoding see a_int.c
71 */
72
73const ASN1_ITEM ASN1_ENUMERATED_it = {
74 .itype = ASN1_ITYPE_PRIMITIVE0x0,
75 .utype = V_ASN1_ENUMERATED10,
76 .sname = "ASN1_ENUMERATED",
77};
78
79ASN1_ENUMERATED *
80ASN1_ENUMERATED_new(void)
81{
82 return (ASN1_ENUMERATED *)ASN1_item_new(&ASN1_ENUMERATED_it);
83}
84
85void
86ASN1_ENUMERATED_free(ASN1_ENUMERATED *a)
87{
88 ASN1_item_free((ASN1_VALUE *)a, &ASN1_ENUMERATED_it);
89}
90
91int
92ASN1_ENUMERATED_set(ASN1_ENUMERATED *a, long v)
93{
94 int j, k;
95 unsigned int i;
96 unsigned char buf[sizeof(long) + 1];
97 long d;
98
99 a->type = V_ASN1_ENUMERATED10;
100 if (a->length < (int)(sizeof(long) + 1)) {
101 free(a->data);
102 a->data = calloc(1, sizeof(long) + 1);
103 }
104 if (a->data == NULL((void*)0)) {
105 ASN1error(ERR_R_MALLOC_FAILURE)ERR_put_error(13,(0xfff),((1|64)),"/usr/src/lib/libcrypto/asn1/a_enum.c"
,105);
106 return (0);
107 }
108 d = v;
109 if (d < 0) {
110 d = -d;
111 a->type = V_ASN1_NEG_ENUMERATED(10 | 0x100);
112 }
113
114 for (i = 0; i < sizeof(long); i++) {
115 if (d == 0)
116 break;
117 buf[i] = (int)d & 0xff;
118 d >>= 8;
119 }
120 j = 0;
121 for (k = i - 1; k >= 0; k--)
122 a->data[j++] = buf[k];
123 a->length = j;
124 return (1);
125}
126
127long
128ASN1_ENUMERATED_get(const ASN1_ENUMERATED *a)
129{
130 int neg = 0, i;
131 unsigned long r = 0;
132
133 if (a == NULL((void*)0))
134 return (0L);
135 i = a->type;
136 if (i == V_ASN1_NEG_ENUMERATED(10 | 0x100))
137 neg = 1;
138 else if (i != V_ASN1_ENUMERATED10)
139 return -1;
140
141 if (a->length > (int)sizeof(long)) {
142 /* hmm... a bit ugly */
143 return -1;
144 }
145 if (a->data == NULL((void*)0))
146 return 0;
147
148 for (i = 0; i < a->length; i++) {
149 r <<= 8;
150 r |= (unsigned char)a->data[i];
151 }
152
153 if (r > LONG_MAX9223372036854775807L)
154 return -1;
155
156 if (neg)
157 return -(long)r;
158 return (long)r;
159}
160
161ASN1_ENUMERATED *
162BN_to_ASN1_ENUMERATED(const BIGNUM *bn, ASN1_ENUMERATED *ai)
163{
164 ASN1_ENUMERATED *ret;
165 int len, j;
166
167 if (ai == NULL((void*)0))
168 ret = ASN1_ENUMERATED_new();
169 else
170 ret = ai;
171 if (ret == NULL((void*)0)) {
172 ASN1error(ERR_R_NESTED_ASN1_ERROR)ERR_put_error(13,(0xfff),(58),"/usr/src/lib/libcrypto/asn1/a_enum.c"
,172);
173 goto err;
174 }
175 if (BN_is_negative(bn))
176 ret->type = V_ASN1_NEG_ENUMERATED(10 | 0x100);
177 else
178 ret->type = V_ASN1_ENUMERATED10;
179 j = BN_num_bits(bn);
180 len = ((j == 0) ? 0 : ((j / 8) + 1));
181 if (ret->length < len + 4) {
182 unsigned char *new_data = realloc(ret->data, len + 4);
183 if (!new_data) {
184 ASN1error(ERR_R_MALLOC_FAILURE)ERR_put_error(13,(0xfff),((1|64)),"/usr/src/lib/libcrypto/asn1/a_enum.c"
,184);
185 goto err;
186 }
187 ret->data = new_data;
188 }
189 ret->length = BN_bn2bin(bn, ret->data);
190
191 /* Correct zero case */
192 if (!ret->length) {
193 ret->data[0] = 0;
194 ret->length = 1;
195 }
196 return (ret);
197
198 err:
199 if (ret != ai)
200 ASN1_ENUMERATED_free(ret);
201 return (NULL((void*)0));
202}
203
204BIGNUM *
205ASN1_ENUMERATED_to_BN(const ASN1_ENUMERATED *ai, BIGNUM *bn)
206{
207 BIGNUM *ret;
208
209 if ((ret = BN_bin2bn(ai->data, ai->length, bn)) == NULL((void*)0))
210 ASN1error(ASN1_R_BN_LIB)ERR_put_error(13,(0xfff),(105),"/usr/src/lib/libcrypto/asn1/a_enum.c"
,210);
211 else if (ai->type == V_ASN1_NEG_ENUMERATED(10 | 0x100))
212 BN_set_negative(ret, 1);
213 return (ret);
214}
215
216/* Based on a_int.c: equivalent ENUMERATED functions */
217
218int
219i2a_ASN1_ENUMERATED(BIO *bp, const ASN1_ENUMERATED *a)
220{
221 int i, n = 0;
222 static const char h[] = "0123456789ABCDEF";
223 char buf[2];
224
225 if (a == NULL((void*)0))
226 return (0);
227
228 if (a->length == 0) {
229 if (BIO_write(bp, "00", 2) != 2)
230 goto err;
231 n = 2;
232 } else {
233 for (i = 0; i < a->length; i++) {
234 if ((i != 0) && (i % 35 == 0)) {
235 if (BIO_write(bp, "\\\n", 2) != 2)
236 goto err;
237 n += 2;
238 }
239 buf[0] = h[((unsigned char)a->data[i] >> 4) & 0x0f];
240 buf[1] = h[((unsigned char)a->data[i]) & 0x0f];
241 if (BIO_write(bp, buf, 2) != 2)
242 goto err;
243 n += 2;
244 }
245 }
246 return (n);
247
248 err:
249 return (-1);
250}
251
252int
253a2i_ASN1_ENUMERATED(BIO *bp, ASN1_ENUMERATED *bs, char *buf, int size)
254{
255 int ret = 0;
256 int i, j,k, m,n, again, bufsize;
257 unsigned char *s = NULL((void*)0), *sp;
1
's' initialized to a null pointer value
→
258 unsigned char *bufp;
259 int first = 1;
260 size_t num = 0, slen = 0;
261
262 bs->type = V_ASN1_ENUMERATED10;
263
264 bufsize = BIO_gets(bp, buf, size);
265 for (;;) {
2
←
Loop condition is true. Entering loop body
→
23
←
Loop condition is true. Entering loop body
→
266 if (bufsize < 1)
3
←
Assuming 'bufsize' is >= 1
→
4
←
Taking false branch
→
24
←
Assuming 'bufsize' is >= 1
→
25
←
Taking false branch
→
267 goto err_sl;
268 i = bufsize;
269 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
→
270 buf[--i] = '\0';
271 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
→
272 goto err_sl;
273 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
→
274 buf[--i] = '\0';
275 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
→
276 goto err_sl;
277 if (buf[i - 1] == '\\') {
11
←
Assuming the condition is true
→
12
←
Taking true branch
→
32
←
Assuming the condition is false
→
33
←
Taking false branch
→
278 i--;
279 again = 1;
280 } else
281 again = 0;
282 buf[i] = '\0';
283 if (i < 2)
13
←
Assuming 'i' is >= 2
→
14
←
Taking false branch
→
34
←
Assuming 'i' is >= 2
→
35
←
Taking false branch
→
284 goto err_sl;
285
286 bufp = (unsigned char *)buf;
287 if (first
14.1
'first' is 1
35.1
'first' is 0
) {
15
←
Taking true branch
→
36
←
Taking false branch
→
288 first = 0;
289 if ((bufp[0] == '0') && (buf[1] == '0')) {
16
←
Assuming the condition is false
→
290 bufp += 2;
291 i -= 2;
292 }
293 }
294 k = 0;
295 if (i % 2 != 0) {
17
←
Assuming the condition is false
→
18
←
Taking false branch
→
37
←
Assuming the condition is false
→
38
←
Taking false branch
→
296 ASN1error(ASN1_R_ODD_NUMBER_OF_CHARS)ERR_put_error(13,(0xfff),(145),"/usr/src/lib/libcrypto/asn1/a_enum.c"
,296);
297 goto err;
298 }
299 i /= 2;
300 if (num + i > slen) {
19
←
Assuming the condition is false
→
20
←
Taking false branch
→
39
←
Assuming the condition is false
→
40
←
Taking false branch
→
301 sp = realloc(s, num + i);
302 if (sp == NULL((void*)0)) {
303 ASN1error(ERR_R_MALLOC_FAILURE)ERR_put_error(13,(0xfff),((1|64)),"/usr/src/lib/libcrypto/asn1/a_enum.c"
,303);
304 goto err;
305 }
306 s = sp;
307 slen = num + i;
308 }
309 for (j = 0; j
20.1
'j' is >= 'i'
 < i; j++, k += 2) {
21
←
Loop condition is false. Execution continues on line 326
→
41
←
Assuming 'j' is < 'i'
→
42
←
Loop condition is true. Entering loop body
→
310 for (n = 0; n < 2; n++) {
43
←
Loop condition is true. Entering loop body
→
311 m = bufp[k + n];
312 if ((m >= '0') && (m <= '9'))
44
←
Assuming the condition is true
→
45
←
Assuming the condition is true
→
46
←
Taking true branch
→
313 m -= '0';
314 else if ((m >= 'a') && (m <= 'f'))
315 m = m - 'a' + 10;
316 else if ((m >= 'A') && (m <= 'F'))
317 m = m - 'A' + 10;
318 else {
319 ASN1error(ASN1_R_NON_HEX_CHARACTERS)ERR_put_error(13,(0xfff),(141),"/usr/src/lib/libcrypto/asn1/a_enum.c"
,319);
320 goto err;
321 }
322 s[num + j] <<= 4;
47
←
Array access (from variable 's') results in a null pointer dereference
323 s[num + j] |= m;
324 }
325 }
326 num += i;
327 if (again
21.1
'again' is 1
)
22
←
Taking true branch
→
328 bufsize = BIO_gets(bp, buf, size);
329 else
330 break;
331 }
332 bs->length = num;
333 bs->data = s;
334 return (1);
335
336 err_sl:
337 ASN1error(ASN1_R_SHORT_LINE)ERR_put_error(13,(0xfff),(150),"/usr/src/lib/libcrypto/asn1/a_enum.c"
,337);
338 err:
339 free(s);
340 return (ret);
341}
342
343int
344i2d_ASN1_ENUMERATED(ASN1_ENUMERATED *a, unsigned char **out)
345{
346 return ASN1_item_i2d((ASN1_VALUE *)a, out, &ASN1_ENUMERATED_it);
347}
348
349ASN1_ENUMERATED *
350d2i_ASN1_ENUMERATED(ASN1_ENUMERATED **a, const unsigned char **in, long len)
351{
352 return (ASN1_ENUMERATED *)ASN1_item_d2i((ASN1_VALUE **)a, in, len,
353 &ASN1_ENUMERATED_it);
354}