1 /**
2 * Copyright (c) 2016-2020, Yann Collet, Facebook, Inc.
3 * All rights reserved.
4 *
5 * This source code is licensed under both the BSD-style license (found in the
6 * LICENSE file in the root directory of this source tree) and the GPLv2 (found
7 * in the COPYING file in the root directory of this source tree).
8 * You may select, at your option, one of the above-listed licenses.
9 */
10
11 /**
12 * This fuzz target attempts to decompress the fuzzed data with the simple
13 * decompression function to ensure the decompressor never crashes.
14 */
15
16 #define ZSTD_STATIC_LINKING_ONLY
17
18 #include <stddef.h>
19 #include <stdlib.h>
20 #include <stdio.h>
21 #include "fuzz_helpers.h"
22 #include "zstd.h"
23
24 static ZSTD_DCtx *dctx = NULL;
25 static void* rBuf = NULL;
26 static size_t bufSize = 0;
27
LLVMFuzzerTestOneInput(const uint8_t * src,size_t size)28 int LLVMFuzzerTestOneInput(const uint8_t *src, size_t size)
29 {
30 size_t const neededBufSize = ZSTD_BLOCKSIZE_MAX;
31
32 /* Allocate all buffers and contexts if not already allocated */
33 if (neededBufSize > bufSize) {
34 free(rBuf);
35 rBuf = FUZZ_malloc(neededBufSize);
36 bufSize = neededBufSize;
37 }
38 if (!dctx) {
39 dctx = ZSTD_createDCtx();
40 FUZZ_ASSERT(dctx);
41 }
42 ZSTD_decompressBegin(dctx);
43 ZSTD_decompressBlock(dctx, rBuf, neededBufSize, src, size);
44
45 #ifndef STATEFUL_FUZZING
46 ZSTD_freeDCtx(dctx); dctx = NULL;
47 #endif
48 return 0;
49 }
50