Bug Summary

File:src/lib/libcrypto/evp/digest.c
Warning:line 189, column 50
Access to field 'ctx_size' results in a dereference of a null pointer (loaded from variable 'type')

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 digest.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/evp/digest.c
1/* $OpenBSD: digest.c,v 1.34 2022/01/10 10:51:31 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 * Copyright (c) 1998-2001 The OpenSSL Project. All rights reserved.
60 *
61 * Redistribution and use in source and binary forms, with or without
62 * modification, are permitted provided that the following conditions
63 * are met:
64 *
65 * 1. Redistributions of source code must retain the above copyright
66 * notice, this list of conditions and the following disclaimer.
67 *
68 * 2. Redistributions in binary form must reproduce the above copyright
69 * notice, this list of conditions and the following disclaimer in
70 * the documentation and/or other materials provided with the
71 * distribution.
72 *
73 * 3. All advertising materials mentioning features or use of this
74 * software must display the following acknowledgment:
75 * "This product includes software developed by the OpenSSL Project
76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
77 *
78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79 * endorse or promote products derived from this software without
80 * prior written permission. For written permission, please contact
81 * openssl-core@openssl.org.
82 *
83 * 5. Products derived from this software may not be called "OpenSSL"
84 * nor may "OpenSSL" appear in their names without prior written
85 * permission of the OpenSSL Project.
86 *
87 * 6. Redistributions of any form whatsoever must retain the following
88 * acknowledgment:
89 * "This product includes software developed by the OpenSSL Project
90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91 *
92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103 * OF THE POSSIBILITY OF SUCH DAMAGE.
104 * ====================================================================
105 *
106 * This product includes cryptographic software written by Eric Young
107 * (eay@cryptsoft.com). This product includes software written by Tim
108 * Hudson (tjh@cryptsoft.com).
109 *
110 */
111
112#include <stdio.h>
113#include <string.h>
114
115#include <openssl/opensslconf.h>
116
117#include <openssl/err.h>
118#include <openssl/evp.h>
119#include <openssl/objects.h>
120
121#ifndef OPENSSL_NO_ENGINE
122#include <openssl/engine.h>
123#endif
124
125#include "evp_locl.h"
126
127int
128EVP_DigestInit(EVP_MD_CTX *ctx, const EVP_MD *type)
129{
130 EVP_MD_CTX_init(ctx);
131 return EVP_DigestInit_ex(ctx, type, NULL((void*)0));
132}
133
134int
135EVP_DigestInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *impl)
136{
137 EVP_MD_CTX_clear_flags(ctx, EVP_MD_CTX_FLAG_CLEANED0x0002);
138
139#ifndef OPENSSL_NO_ENGINE
140 /* Whether it's nice or not, "Inits" can be used on "Final"'d contexts
141 * so this context may already have an ENGINE! Try to avoid releasing
142 * the previous handle, re-querying for an ENGINE, and having a
143 * reinitialisation, when it may all be unecessary. */
144 if (ctx->engine && ctx->digest && (!type ||
5
←
Assuming field 'engine' is null
→
145 (type && (type->type == ctx->digest->type))))
146 goto skip_to_init;
147 if (type) {
6
←
Assuming 'type' is null
→
7
←
Taking false branch
→
148 /* Ensure an ENGINE left lying around from last time is cleared
149 * (the previous check attempted to avoid this if the same
150 * ENGINE and EVP_MD could be used). */
151 ENGINE_finish(ctx->engine);
152 if (impl != NULL((void*)0)) {
153 if (!ENGINE_init(impl)) {
154 EVPerror(EVP_R_INITIALIZATION_ERROR)ERR_put_error(6,(0xfff),(134),"/usr/src/lib/libcrypto/evp/digest.c"
,154);
155 return 0;
156 }
157 } else
158 /* Ask if an ENGINE is reserved for this job */
159 impl = ENGINE_get_digest_engine(type->type);
160 if (impl != NULL((void*)0)) {
161 /* There's an ENGINE for this job ... (apparently) */
162 const EVP_MD *d = ENGINE_get_digest(impl, type->type);
163 if (d == NULL((void*)0)) {
164 /* Same comment from evp_enc.c */
165 EVPerror(EVP_R_INITIALIZATION_ERROR)ERR_put_error(6,(0xfff),(134),"/usr/src/lib/libcrypto/evp/digest.c"
,165);
166 ENGINE_finish(impl);
167 return 0;
168 }
169 /* We'll use the ENGINE's private digest definition */
170 type = d;
171 /* Store the ENGINE functional reference so we know
172 * 'type' came from an ENGINE and we need to release
173 * it when done. */
174 ctx->engine = impl;
175 } else
176 ctx->engine = NULL((void*)0);
177 } else if (!ctx->digest) {
8
←
Assuming field 'digest' is non-null
→
9
←
Taking false branch
→
178 EVPerror(EVP_R_NO_DIGEST_SET)ERR_put_error(6,(0xfff),(139),"/usr/src/lib/libcrypto/evp/digest.c"
,178);
179 return 0;
180 }
181#endif
182 if (ctx->digest != type
9.1
'type' is not equal to field 'digest'
) {
10
←
Taking true branch
→
183 if (ctx->digest
10.1
Field 'digest' is non-null
 && ctx->digest->ctx_size && ctx->md_data &&
11
←
Assuming field 'ctx_size' is 0
→
184 !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_REUSE0x0004)) {
185 freezero(ctx->md_data, ctx->digest->ctx_size);
186 ctx->md_data = NULL((void*)0);
187 }
188 ctx->digest = type;
189 if (!(ctx->flags & EVP_MD_CTX_FLAG_NO_INIT0x0100) && type->ctx_size) {
12
←
Assuming the condition is true
→
13
←
Access to field 'ctx_size' results in a dereference of a null pointer (loaded from variable 'type')
190 ctx->update = type->update;
191 ctx->md_data = calloc(1, type->ctx_size);
192 if (ctx->md_data == NULL((void*)0)) {
193 EVP_PKEY_CTX_free(ctx->pctx);
194 ctx->pctx = NULL((void*)0);
195 EVPerror(ERR_R_MALLOC_FAILURE)ERR_put_error(6,(0xfff),((1|64)),"/usr/src/lib/libcrypto/evp/digest.c"
,195);
196 return 0;
197 }
198 }
199 }
200#ifndef OPENSSL_NO_ENGINE
201skip_to_init:
202#endif
203 if (ctx->pctx) {
204 int r;
205 r = EVP_PKEY_CTX_ctrl(ctx->pctx, -1, EVP_PKEY_OP_TYPE_SIG((1<<3) | (1<<4) | (1<<5) | (1<<6) | (
1<<7)),
206 EVP_PKEY_CTRL_DIGESTINIT7, 0, ctx);
207 if (r <= 0 && (r != -2))
208 return 0;
209 }
210 if (ctx->flags & EVP_MD_CTX_FLAG_NO_INIT0x0100)
211 return 1;
212 return ctx->digest->init(ctx);
213}
214
215int
216EVP_DigestUpdate(EVP_MD_CTX *ctx, const void *data, size_t count)
217{
218 return ctx->update(ctx, data, count);
219}
220
221/* The caller can assume that this removes any secret data from the context */
222int
223EVP_DigestFinal(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size)
224{
225 int ret;
226
227 ret = EVP_DigestFinal_ex(ctx, md, size);
228 EVP_MD_CTX_cleanup(ctx);
229 return ret;
230}
231
232/* The caller can assume that this removes any secret data from the context */
233int
234EVP_DigestFinal_ex(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size)
235{
236 int ret;
237
238 if ((size_t)ctx->digest->md_size > EVP_MAX_MD_SIZE64) {
239 EVPerror(EVP_R_TOO_LARGE)ERR_put_error(6,(0xfff),(164),"/usr/src/lib/libcrypto/evp/digest.c"
,239);
240 return 0;
241 }
242 ret = ctx->digest->final(ctx, md);
243 if (size != NULL((void*)0))
244 *size = ctx->digest->md_size;
245 if (ctx->digest->cleanup) {
246 ctx->digest->cleanup(ctx);
247 EVP_MD_CTX_set_flags(ctx, EVP_MD_CTX_FLAG_CLEANED0x0002);
248 }
249 memset(ctx->md_data, 0, ctx->digest->ctx_size);
250 return ret;
251}
252
253int
254EVP_MD_CTX_copy(EVP_MD_CTX *out, const EVP_MD_CTX *in)
255{
256 EVP_MD_CTX_init(out);
257 return EVP_MD_CTX_copy_ex(out, in);
258}
259
260int
261EVP_MD_CTX_copy_ex(EVP_MD_CTX *out, const EVP_MD_CTX *in)
262{
263 unsigned char *tmp_buf;
264
265 if ((in == NULL((void*)0)) || (in->digest == NULL((void*)0))) {
266 EVPerror(EVP_R_INPUT_NOT_INITIALIZED)ERR_put_error(6,(0xfff),(111),"/usr/src/lib/libcrypto/evp/digest.c"
,266);
267 return 0;
268 }
269#ifndef OPENSSL_NO_ENGINE
270 /* Make sure it's safe to copy a digest context using an ENGINE */
271 if (in->engine && !ENGINE_init(in->engine)) {
272 EVPerror(ERR_R_ENGINE_LIB)ERR_put_error(6,(0xfff),(38),"/usr/src/lib/libcrypto/evp/digest.c"
,272);
273 return 0;
274 }
275#endif
276
277 if (out->digest == in->digest) {
278 tmp_buf = out->md_data;
279 EVP_MD_CTX_set_flags(out, EVP_MD_CTX_FLAG_REUSE0x0004);
280 } else
281 tmp_buf = NULL((void*)0);
282 EVP_MD_CTX_cleanup(out);
283 memcpy(out, in, sizeof *out);
284 out->md_data = NULL((void*)0);
285 out->pctx = NULL((void*)0);
286
287 /*
288 * Because of the EVP_PKEY_CTX_dup() below, EVP_MD_CTX_cleanup() needs
289 * to free out->pctx in all cases (even if this flag is set on in).
290 */
291 EVP_MD_CTX_clear_flags(out, EVP_MD_CTX_FLAG_KEEP_PKEY_CTX0x0400);
292
293 if (in->md_data && out->digest->ctx_size) {
294 if (tmp_buf) {
295 out->md_data = tmp_buf;
296 } else {
297 out->md_data = calloc(1, out->digest->ctx_size);
298 if (out->md_data == NULL((void*)0)) {
299 EVPerror(ERR_R_MALLOC_FAILURE)ERR_put_error(6,(0xfff),((1|64)),"/usr/src/lib/libcrypto/evp/digest.c"
,299);
300 return 0;
301 }
302 }
303 memcpy(out->md_data, in->md_data, out->digest->ctx_size);
304 }
305
306 out->update = in->update;
307
308 if (in->pctx) {
309 out->pctx = EVP_PKEY_CTX_dup(in->pctx);
310 if (!out->pctx) {
311 EVP_MD_CTX_cleanup(out);
312 return 0;
313 }
314 }
315
316 if (out->digest->copy)
317 return out->digest->copy(out, in);
318
319 return 1;
320}
321
322int
323EVP_Digest(const void *data, size_t count,
324 unsigned char *md, unsigned int *size, const EVP_MD *type, ENGINE *impl)
325{
326 EVP_MD_CTX ctx;
327 int ret;
328
329 EVP_MD_CTX_init(&ctx);
1
Calling 'EVP_MD_CTX_init'
→
2
←
Returning from 'EVP_MD_CTX_init'
→
330 EVP_MD_CTX_set_flags(&ctx, EVP_MD_CTX_FLAG_ONESHOT0x0001);
331 ret = EVP_DigestInit_ex(&ctx, type, impl) &&
3
←
Passing value via 2nd parameter 'type'
→
4
←
Calling 'EVP_DigestInit_ex'
→
332 EVP_DigestUpdate(&ctx, data, count) &&
333 EVP_DigestFinal_ex(&ctx, md, size);
334 EVP_MD_CTX_cleanup(&ctx);
335
336 return ret;
337}
338
339EVP_MD_CTX *
340EVP_MD_CTX_new(void)
341{
342 return calloc(1, sizeof(EVP_MD_CTX));
343}
344
345void
346EVP_MD_CTX_free(EVP_MD_CTX *ctx)
347{
348 if (ctx == NULL((void*)0))
349 return;
350
351 EVP_MD_CTX_cleanup(ctx);
352
353 free(ctx);
354}
355
356void
357EVP_MD_CTX_init(EVP_MD_CTX *ctx)
358{
359 memset(ctx, 0, sizeof(*ctx));
360}
361
362int
363EVP_MD_CTX_reset(EVP_MD_CTX *ctx)
364{
365 return EVP_MD_CTX_cleanup(ctx);
366}
367
368EVP_MD_CTX *
369EVP_MD_CTX_create(void)
370{
371 return EVP_MD_CTX_new();
372}
373
374void
375EVP_MD_CTX_destroy(EVP_MD_CTX *ctx)
376{
377 EVP_MD_CTX_free(ctx);
378}
379
380/* This call frees resources associated with the context */
381int
382EVP_MD_CTX_cleanup(EVP_MD_CTX *ctx)
383{
384 /*
385 * Don't assume ctx->md_data was cleaned in EVP_Digest_Final,
386 * because sometimes only copies of the context are ever finalised.
387 */
388 if (ctx->digest && ctx->digest->cleanup &&
389 !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_CLEANED0x0002))
390 ctx->digest->cleanup(ctx);
391 if (ctx->digest && ctx->digest->ctx_size && ctx->md_data &&
392 !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_REUSE0x0004))
393 freezero(ctx->md_data, ctx->digest->ctx_size);
394 /*
395 * If EVP_MD_CTX_FLAG_KEEP_PKEY_CTX is set, EVP_MD_CTX_set_pkey() was
396 * called and its strange API contract implies we don't own ctx->pctx.
397 */
398 if (!EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_KEEP_PKEY_CTX0x0400))
399 EVP_PKEY_CTX_free(ctx->pctx);
400#ifndef OPENSSL_NO_ENGINE
401 ENGINE_finish(ctx->engine);
402#endif
403 memset(ctx, 0, sizeof(*ctx));
404
405 return 1;
406}
407
408int
409EVP_MD_CTX_ctrl(EVP_MD_CTX *ctx, int type, int arg, void *ptr)
410{
411 int ret;
412
413 if (!ctx->digest) {
414 EVPerror(EVP_R_NO_CIPHER_SET)ERR_put_error(6,(0xfff),(131),"/usr/src/lib/libcrypto/evp/digest.c"
,414);
415 return 0;
416 }
417
418 if (!ctx->digest->md_ctrl) {
419 EVPerror(EVP_R_CTRL_NOT_IMPLEMENTED)ERR_put_error(6,(0xfff),(132),"/usr/src/lib/libcrypto/evp/digest.c"
,419);
420 return 0;
421 }
422
423 ret = ctx->digest->md_ctrl(ctx, type, arg, ptr);
424 if (ret == -1) {
425 EVPerror(EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED)ERR_put_error(6,(0xfff),(133),"/usr/src/lib/libcrypto/evp/digest.c"
,425);
426 return 0;
427 }
428 return ret;
429}