120 lines
3.3 KiB
C
120 lines
3.3 KiB
C
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/*
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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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 the fuzzed data with the simple
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* decompression function to ensure the decompressor never crashes.
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*/
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#define ZSTD_STATIC_LINKING_ONLY
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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 "fuzz_data_producer.h"
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static ZSTD_DStream *dstream = NULL;
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uint32_t seed;
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static ZSTD_outBuffer makeOutBuffer(FUZZ_dataProducer_t *producer, void* buf, size_t bufSize)
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{
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ZSTD_outBuffer buffer = { buf, 0, 0 };
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if (FUZZ_dataProducer_empty(producer)) {
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buffer.size = bufSize;
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} else {
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buffer.size = (FUZZ_dataProducer_uint32Range(producer, 0, bufSize));
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}
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FUZZ_ASSERT(buffer.size <= bufSize);
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if (buffer.size == 0) {
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buffer.dst = NULL;
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}
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return buffer;
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}
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static ZSTD_inBuffer makeInBuffer(const uint8_t **src, size_t *size,
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FUZZ_dataProducer_t *producer)
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{
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ZSTD_inBuffer buffer = { *src, 0, 0 };
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FUZZ_ASSERT(*size > 0);
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if (FUZZ_dataProducer_empty(producer)) {
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buffer.size = *size;
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} else {
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buffer.size = (FUZZ_dataProducer_uint32Range(producer, 0, *size));
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}
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FUZZ_ASSERT(buffer.size <= *size);
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*src += buffer.size;
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*size -= buffer.size;
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if (buffer.size == 0) {
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buffer.src = NULL;
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}
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return buffer;
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}
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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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int stableOutBuffer;
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ZSTD_outBuffer out;
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void* buf;
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size_t bufSize;
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size = FUZZ_dataProducer_reserveDataPrefix(producer);
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bufSize = MAX(10 * size, ZSTD_BLOCKSIZE_MAX);
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/* Allocate all buffers and contexts if not already allocated */
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buf = FUZZ_malloc(bufSize);
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if (!dstream) {
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dstream = ZSTD_createDStream();
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FUZZ_ASSERT(dstream);
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} else {
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FUZZ_ZASSERT(ZSTD_DCtx_reset(dstream, ZSTD_reset_session_only));
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}
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stableOutBuffer = FUZZ_dataProducer_uint32Range(producer, 0, 10) == 5;
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if (stableOutBuffer) {
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FUZZ_ZASSERT(ZSTD_DCtx_setParameter(dstream, ZSTD_d_stableOutBuffer, 1));
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out.dst = buf;
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out.size = bufSize;
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out.pos = 0;
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} else {
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out = makeOutBuffer(producer, buf, bufSize);
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}
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while (size > 0) {
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ZSTD_inBuffer in = makeInBuffer(&src, &size, producer);
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do {
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size_t const rc = ZSTD_decompressStream(dstream, &out, &in);
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if (ZSTD_isError(rc)) goto error;
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if (out.pos == out.size) {
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if (stableOutBuffer) goto error;
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out = makeOutBuffer(producer, buf, bufSize);
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}
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} while (in.pos != in.size);
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}
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error:
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#ifndef STATEFUL_FUZZING
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ZSTD_freeDStream(dstream); dstream = NULL;
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#endif
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FUZZ_dataProducer_free(producer);
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free(buf);
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return 0;
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}
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