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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 simple
* decompression function to ensure the decompressor never crashes.
*/
#define ZSTD_STATIC_LINKING_ONLY
#include <stddef.h>
#include <stdlib.h>
#include <stdio.h>
#include "fuzz_helpers.h"
#include "zstd.h"
static size_t const kBufSize = ZSTD_BLOCKSIZE_MAX;
static ZSTD_DStream *dstream = NULL;
static void* buf = NULL;
uint32_t seed;
static ZSTD_outBuffer makeOutBuffer(void)
{
ZSTD_outBuffer buffer = { buf, 0, 0 };
buffer.size = (FUZZ_rand(&seed) % kBufSize) + 1;
FUZZ_ASSERT(buffer.size <= kBufSize);
return buffer;
}
static ZSTD_inBuffer makeInBuffer(const uint8_t **src, size_t *size)
{
ZSTD_inBuffer buffer = { *src, 0, 0 };
FUZZ_ASSERT(*size > 0);
buffer.size = (FUZZ_rand(&seed) % *size) + 1;
FUZZ_ASSERT(buffer.size <= *size);
*src += buffer.size;
*size -= buffer.size;
return buffer;
}
int LLVMFuzzerTestOneInput(const uint8_t *src, size_t size)
{
seed = FUZZ_seed(&src, &size);
/* Allocate all buffers and contexts if not already allocated */
if (!buf) {
buf = malloc(kBufSize);
FUZZ_ASSERT(buf);
}
if (!dstream) {
dstream = ZSTD_createDStream();
FUZZ_ASSERT(dstream);
FUZZ_ASSERT(!ZSTD_isError(ZSTD_initDStream(dstream)));
} else {
FUZZ_ASSERT(!ZSTD_isError(ZSTD_resetDStream(dstream)));
}
while (size > 0) {
ZSTD_inBuffer in = makeInBuffer(&src, &size);
while (in.pos != in.size) {
ZSTD_outBuffer out = makeOutBuffer();
size_t const rc = ZSTD_decompressStream(dstream, &out, &in);
if (ZSTD_isError(rc)) goto error;
if (rc == 0) FUZZ_ASSERT(!ZSTD_isError(ZSTD_resetDStream(dstream)));
}
}
error:
#ifndef STATEFUL_FUZZING
ZSTD_freeDStream(dstream); dstream = NULL;
#endif
return 0;
}
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