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1 | /* |
2 | * Copyright (c) Meta Platforms, Inc. and affiliates. |
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 simple |
13 | * decompression function to ensure the decompressor never crashes. |
14 | */ |
15 | |
16 | #include <stddef.h> |
17 | #include <stdlib.h> |
18 | #include <stdio.h> |
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19 | |
20 | #define ZSTD_STATIC_LINKING_ONLY |
21 | |
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22 | #include "fuzz_helpers.h" |
23 | #include "zstd.h" |
24 | #include "fuzz_data_producer.h" |
25 | |
26 | static ZSTD_DCtx *dctx = NULL; |
27 | |
28 | int LLVMFuzzerTestOneInput(const uint8_t *src, size_t size) |
29 | { |
30 | /* Give a random portion of src data to the producer, to use for |
31 | parameter generation. The rest will be used for (de)compression */ |
32 | FUZZ_dataProducer_t *producer = FUZZ_dataProducer_create(src, size); |
33 | size = FUZZ_dataProducer_reserveDataPrefix(producer); |
34 | |
35 | if (!dctx) { |
36 | dctx = ZSTD_createDCtx(); |
37 | FUZZ_ASSERT(dctx); |
38 | } |
39 | |
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40 | { |
41 | size_t const bufSize = FUZZ_dataProducer_uint32Range(producer, 0, 10 * size); |
42 | void *rBuf = FUZZ_malloc(bufSize); |
43 | size_t const dSize = ZSTD_decompressDCtx(dctx, rBuf, bufSize, src, size); |
44 | if (!ZSTD_isError(dSize)) { |
45 | /* If decompression was successful, the content size from the frame header(s) should be valid. */ |
46 | unsigned long long const expectedSize = ZSTD_findDecompressedSize(src, size); |
47 | FUZZ_ASSERT(expectedSize != ZSTD_CONTENTSIZE_ERROR); |
48 | FUZZ_ASSERT(expectedSize == ZSTD_CONTENTSIZE_UNKNOWN || expectedSize == dSize); |
49 | } |
50 | free(rBuf); |
51 | } |
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52 | |
53 | FUZZ_dataProducer_free(producer); |
54 | |
55 | #ifndef STATEFUL_FUZZING |
56 | ZSTD_freeDCtx(dctx); dctx = NULL; |
57 | #endif |
58 | return 0; |
59 | } |