zstd/tests/fuzz/dictionary_decompress.c

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/*
* Copyright (c) 2016-present, 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).
*/
/**
* 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"
static ZSTD_DCtx *dctx = NULL;
int LLVMFuzzerTestOneInput(const uint8_t *src, size_t size)
{
uint32_t seed = FUZZ_seed(&src, &size);
FUZZ_dict_t dict;
ZSTD_DDict* ddict = NULL;
int i;
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if (!dctx) {
dctx = ZSTD_createDCtx();
FUZZ_ASSERT(dctx);
}
dict = FUZZ_train(src, size, &seed);
if (FUZZ_rand32(&seed, 0, 1) == 0) {
ddict = ZSTD_createDDict(dict.buff, dict.size);
FUZZ_ASSERT(ddict);
} else {
FUZZ_ZASSERT(ZSTD_DCtx_loadDictionary_advanced(
dctx, dict.buff, dict.size,
(ZSTD_dictLoadMethod_e)FUZZ_rand32(&seed, 0, 1),
(ZSTD_dictContentType_e)FUZZ_rand32(&seed, 0, 2)));
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}
/* Run it 10 times over 10 output sizes. Reuse the context and dict. */
for (i = 0; i < 10; ++i) {
size_t const bufSize = FUZZ_rand32(&seed, 0, 2 * size);
void* rBuf = malloc(bufSize);
FUZZ_ASSERT(rBuf);
if (ddict) {
ZSTD_decompress_usingDDict(dctx, rBuf, bufSize, src, size, ddict);
} else {
ZSTD_decompressDCtx(dctx, rBuf, bufSize, src, size);
}
free(rBuf);
}
free(dict.buff);
ZSTD_freeDDict(ddict);
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#ifndef STATEFUL_FUZZING
ZSTD_freeDCtx(dctx); dctx = NULL;
#endif
return 0;
}