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/*
* Copyright (c) 2016-2020, 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 a valid compressed frame into
* an output buffer that is too small to ensure we always get
* ZSTD_error_dstSize_tooSmall.
*/
#include <stddef.h>
#include <stdlib.h>
#include <stdio.h>
#include "fuzz_helpers.h"
#include "zstd.h"
#include "zstd_errors.h"
#include "zstd_helpers.h"
#include "fuzz_data_producer.h"
static ZSTD_CCtx *cctx = NULL;
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_t rBufSize = FUZZ_dataProducer_uint32Range(producer, 0, size);
size = FUZZ_dataProducer_remainingBytes(producer);
/* Ensure the round-trip buffer is too small. */
if (rBufSize >= size) {
rBufSize = size > 0 ? size - 1 : 0;
}
size_t const cBufSize = ZSTD_compressBound(size);
if (!cctx) {
cctx = ZSTD_createCCtx();
FUZZ_ASSERT(cctx);
}
if (!dctx) {
dctx = ZSTD_createDCtx();
FUZZ_ASSERT(dctx);
}
void *cBuf = FUZZ_malloc(cBufSize);
void *rBuf = FUZZ_malloc(rBufSize);
size_t const cSize = ZSTD_compressCCtx(cctx, cBuf, cBufSize, src, size, 1);
FUZZ_ZASSERT(cSize);
size_t const rSize = ZSTD_decompressDCtx(dctx, rBuf, rBufSize, cBuf, cSize);
if (size == 0) {
FUZZ_ASSERT(rSize == 0);
} else {
FUZZ_ASSERT(ZSTD_isError(rSize));
FUZZ_ASSERT(ZSTD_getErrorCode(rSize) == ZSTD_error_dstSize_tooSmall);
}
free(cBuf);
free(rBuf);
FUZZ_dataProducer_free(producer);
#ifndef STATEFUL_FUZZING
ZSTD_freeCCtx(cctx); cctx = NULL;
ZSTD_freeDCtx(dctx); dctx = NULL;
#endif
return 0;
}
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