71 lines
2.2 KiB
C
71 lines
2.2 KiB
C
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/*
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* Copyright (c) 2016-2020, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under both the BSD-style license (found in the
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* LICENSE file in the root directory of this source tree) and the GPLv2 (found
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* in the COPYING file in the root directory of this source tree).
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* You may select, at your option, one of the above-listed licenses.
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*/
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/**
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* This fuzz target attempts to decompress a valid compressed frame into
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* an output buffer that is too small to ensure we always get
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* ZSTD_error_dstSize_tooSmall.
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*/
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#include <stddef.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include "fuzz_helpers.h"
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#include "zstd.h"
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#include "zstd_errors.h"
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#include "zstd_helpers.h"
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#include "fuzz_data_producer.h"
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static ZSTD_CCtx *cctx = NULL;
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static ZSTD_DCtx *dctx = NULL;
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int LLVMFuzzerTestOneInput(const uint8_t *src, size_t size)
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{
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/* Give a random portion of src data to the producer, to use for
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parameter generation. The rest will be used for (de)compression */
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FUZZ_dataProducer_t *producer = FUZZ_dataProducer_create(src, size);
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size_t rBufSize = FUZZ_dataProducer_uint32Range(producer, 0, size);
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size = FUZZ_dataProducer_remainingBytes(producer);
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/* Ensure the round-trip buffer is too small. */
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if (rBufSize >= size) {
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rBufSize = size > 0 ? size - 1 : 0;
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}
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size_t const cBufSize = ZSTD_compressBound(size);
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if (!cctx) {
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cctx = ZSTD_createCCtx();
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FUZZ_ASSERT(cctx);
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}
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if (!dctx) {
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dctx = ZSTD_createDCtx();
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FUZZ_ASSERT(dctx);
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}
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void *cBuf = FUZZ_malloc(cBufSize);
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void *rBuf = FUZZ_malloc(rBufSize);
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size_t const cSize = ZSTD_compressCCtx(cctx, cBuf, cBufSize, src, size, 1);
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FUZZ_ZASSERT(cSize);
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size_t const rSize = ZSTD_decompressDCtx(dctx, rBuf, rBufSize, cBuf, cSize);
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if (size == 0) {
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FUZZ_ASSERT(rSize == 0);
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} else {
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FUZZ_ASSERT(ZSTD_isError(rSize));
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FUZZ_ASSERT(ZSTD_getErrorCode(rSize) == ZSTD_error_dstSize_tooSmall);
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}
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free(cBuf);
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free(rBuf);
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FUZZ_dataProducer_free(producer);
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#ifndef STATEFUL_FUZZING
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ZSTD_freeCCtx(cctx); cctx = NULL;
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ZSTD_freeDCtx(dctx); dctx = NULL;
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#endif
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return 0;
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}
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