| /* |
| * 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; |
| } |