1 /*
2 * Copyright (c) 2016-2020, Facebook, Inc.
3 * All rights reserved.
4 *
5 * This source code is licensed under both the BSD-style license (found in the
6 * LICENSE file in the root directory of this source tree) and the GPLv2 (found
7 * in the COPYING file in the root directory of this source tree).
8 * You may select, at your option, one of the above-listed licenses.
9 */
10
11 /**
12 * This fuzz target attempts to decompress the fuzzed data with the dictionary
13 * decompression function to ensure the decompressor never crashes. It does not
14 * fuzz the dictionary.
15 */
16
17 #include <stddef.h>
18 #include <stdlib.h>
19 #include <stdio.h>
20 #include "fuzz_helpers.h"
21 #include "zstd_helpers.h"
22 #include "fuzz_data_producer.h"
23
24 static ZSTD_DCtx *dctx = NULL;
25
LLVMFuzzerTestOneInput(const uint8_t * src,size_t size)26 int LLVMFuzzerTestOneInput(const uint8_t *src, size_t size)
27 {
28 /* Give a random portion of src data to the producer, to use for
29 parameter generation. The rest will be used for (de)compression */
30 FUZZ_dataProducer_t *producer = FUZZ_dataProducer_create(src, size);
31 size = FUZZ_dataProducer_reserveDataPrefix(producer);
32
33 FUZZ_dict_t dict;
34 ZSTD_DDict* ddict = NULL;
35
36 if (!dctx) {
37 dctx = ZSTD_createDCtx();
38 FUZZ_ASSERT(dctx);
39 }
40 dict = FUZZ_train(src, size, producer);
41 if (FUZZ_dataProducer_uint32Range(producer, 0, 1) == 0) {
42 ddict = ZSTD_createDDict(dict.buff, dict.size);
43 FUZZ_ASSERT(ddict);
44 } else {
45 if (FUZZ_dataProducer_uint32Range(producer, 0, 1) == 0)
46 FUZZ_ZASSERT(ZSTD_DCtx_loadDictionary_advanced(
47 dctx, dict.buff, dict.size,
48 (ZSTD_dictLoadMethod_e)FUZZ_dataProducer_uint32Range(producer, 0, 1),
49 (ZSTD_dictContentType_e)FUZZ_dataProducer_uint32Range(producer, 0, 2)));
50 else
51 FUZZ_ZASSERT(ZSTD_DCtx_refPrefix_advanced(
52 dctx, dict.buff, dict.size,
53 (ZSTD_dictContentType_e)FUZZ_dataProducer_uint32Range(producer, 0, 2)));
54 }
55
56 {
57 size_t const bufSize = FUZZ_dataProducer_uint32Range(producer, 0, 10 * size);
58 void* rBuf = FUZZ_malloc(bufSize);
59 if (ddict) {
60 ZSTD_decompress_usingDDict(dctx, rBuf, bufSize, src, size, ddict);
61 } else {
62 ZSTD_decompressDCtx(dctx, rBuf, bufSize, src, size);
63 }
64 free(rBuf);
65 }
66 free(dict.buff);
67 FUZZ_dataProducer_free(producer);
68 ZSTD_freeDDict(ddict);
69 #ifndef STATEFUL_FUZZING
70 ZSTD_freeDCtx(dctx); dctx = NULL;
71 #endif
72 return 0;
73 }
74