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- /*
- * Copyright (c) 2016-2021, Facebook, Inc.
- * All rights reserved.
- *
- * This source code is licensed under both the BSD-style license (found in the
- * LICENSE file in the root directory of this source tree) and the GPLv2 (found
- * in the COPYING file in the root directory of this source tree).
- * You may select, at your option, one of the above-listed licenses.
- */
- /**
- * This fuzz target attempts to decompress the fuzzed data with the dictionary
- * decompression function to ensure the decompressor never crashes. It does not
- * fuzz the dictionary.
- */
- #include <stddef.h>
- #include <stdlib.h>
- #include <stdio.h>
- #include "fuzz_helpers.h"
- #include "zstd_helpers.h"
- #include "fuzz_data_producer.h"
- static ZSTD_DCtx *dctx = NULL;
- int LLVMFuzzerTestOneInput(const uint8_t *src, size_t size)
- {
- /* Give a random portion of src data to the producer, to use for
- parameter generation. The rest will be used for (de)compression */
- FUZZ_dataProducer_t *producer = FUZZ_dataProducer_create(src, size);
- size = FUZZ_dataProducer_reserveDataPrefix(producer);
- FUZZ_dict_t dict;
- ZSTD_DDict* ddict = NULL;
- if (!dctx) {
- dctx = ZSTD_createDCtx();
- FUZZ_ASSERT(dctx);
- }
- dict = FUZZ_train(src, size, producer);
- if (FUZZ_dataProducer_uint32Range(producer, 0, 1) == 0) {
- ddict = ZSTD_createDDict(dict.buff, dict.size);
- FUZZ_ASSERT(ddict);
- } else {
- if (FUZZ_dataProducer_uint32Range(producer, 0, 1) == 0)
- FUZZ_ZASSERT(ZSTD_DCtx_loadDictionary_advanced(
- dctx, dict.buff, dict.size,
- (ZSTD_dictLoadMethod_e)FUZZ_dataProducer_uint32Range(producer, 0, 1),
- (ZSTD_dictContentType_e)FUZZ_dataProducer_uint32Range(producer, 0, 2)));
- else
- FUZZ_ZASSERT(ZSTD_DCtx_refPrefix_advanced(
- dctx, dict.buff, dict.size,
- (ZSTD_dictContentType_e)FUZZ_dataProducer_uint32Range(producer, 0, 2)));
- }
- {
- size_t const bufSize = FUZZ_dataProducer_uint32Range(producer, 0, 10 * size);
- void* rBuf = FUZZ_malloc(bufSize);
- if (ddict) {
- ZSTD_decompress_usingDDict(dctx, rBuf, bufSize, src, size, ddict);
- } else {
- ZSTD_decompressDCtx(dctx, rBuf, bufSize, src, size);
- }
- free(rBuf);
- }
- free(dict.buff);
- FUZZ_dataProducer_free(producer);
- ZSTD_freeDDict(ddict);
- #ifndef STATEFUL_FUZZING
- ZSTD_freeDCtx(dctx); dctx = NULL;
- #endif
- return 0;
- }
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