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- /*
- * Copyright (c) 2016-2021, 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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