648db22b |
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 a valid compressed frame into |
13 | * an output buffer that is too small to ensure we always get |
14 | * ZSTD_error_dstSize_tooSmall. |
15 | */ |
16 | |
17 | #include <stddef.h> |
18 | #include <stdlib.h> |
19 | #include <stdio.h> |
20 | #include "fuzz_helpers.h" |
21 | #include "zstd.h" |
22 | #include "zstd_errors.h" |
23 | #include "zstd_helpers.h" |
24 | #include "fuzz_data_producer.h" |
25 | #include "fuzz_third_party_seq_prod.h" |
26 | |
27 | static ZSTD_CCtx *cctx = NULL; |
28 | static ZSTD_DCtx *dctx = NULL; |
29 | |
30 | int LLVMFuzzerTestOneInput(const uint8_t *src, size_t size) |
31 | { |
32 | FUZZ_SEQ_PROD_SETUP(); |
33 | |
34 | /* Give a random portion of src data to the producer, to use for |
35 | parameter generation. The rest will be used for (de)compression */ |
36 | FUZZ_dataProducer_t *producer = FUZZ_dataProducer_create(src, size); |
37 | size_t rBufSize = FUZZ_dataProducer_uint32Range(producer, 0, size); |
38 | size = FUZZ_dataProducer_remainingBytes(producer); |
39 | /* Ensure the round-trip buffer is too small. */ |
40 | if (rBufSize >= size) { |
41 | rBufSize = size > 0 ? size - 1 : 0; |
42 | } |
43 | size_t const cBufSize = ZSTD_compressBound(size); |
44 | |
45 | if (!cctx) { |
46 | cctx = ZSTD_createCCtx(); |
47 | FUZZ_ASSERT(cctx); |
48 | } |
49 | if (!dctx) { |
50 | dctx = ZSTD_createDCtx(); |
51 | FUZZ_ASSERT(dctx); |
52 | } |
53 | |
54 | void *cBuf = FUZZ_malloc(cBufSize); |
55 | void *rBuf = FUZZ_malloc(rBufSize); |
56 | size_t const cSize = ZSTD_compressCCtx(cctx, cBuf, cBufSize, src, size, 1); |
57 | FUZZ_ZASSERT(cSize); |
58 | size_t const rSize = ZSTD_decompressDCtx(dctx, rBuf, rBufSize, cBuf, cSize); |
59 | if (size == 0) { |
60 | FUZZ_ASSERT(rSize == 0); |
61 | } else { |
62 | FUZZ_ASSERT(ZSTD_isError(rSize)); |
63 | FUZZ_ASSERT(ZSTD_getErrorCode(rSize) == ZSTD_error_dstSize_tooSmall); |
64 | } |
65 | free(cBuf); |
66 | free(rBuf); |
67 | FUZZ_dataProducer_free(producer); |
68 | #ifndef STATEFUL_FUZZING |
69 | ZSTD_freeCCtx(cctx); cctx = NULL; |
70 | ZSTD_freeDCtx(dctx); dctx = NULL; |
71 | #endif |
72 | FUZZ_SEQ_PROD_TEARDOWN(); |
73 | return 0; |
74 | } |