| 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> |
| 19 | |
| 20 | #define ZSTD_STATIC_LINKING_ONLY |
| 21 | |
| 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 | |
| 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 | } |
| 52 | |
| 53 | FUZZ_dataProducer_free(producer); |
| 54 | |
| 55 | #ifndef STATEFUL_FUZZING |
| 56 | ZSTD_freeDCtx(dctx); dctx = NULL; |
| 57 | #endif |
| 58 | return 0; |
| 59 | } |