1 /**
2 * Copyright (c) 2016-present, 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 */
9
10 /**
11 * This fuzz target attempts to decompress the fuzzed data with the simple
12 * decompression function to ensure the decompressor never crashes.
13 */
14
15 #define ZSTD_STATIC_LINKING_ONLY
16
17 #include <stddef.h>
18 #include <stdlib.h>
19 #include <stdio.h>
20 #include "fuzz_helpers.h"
21 #include "zstd.h"
22
23 static ZSTD_DCtx *dctx = NULL;
24 static void* rBuf = NULL;
25 static size_t bufSize = 0;
26
LLVMFuzzerTestOneInput(const uint8_t * src,size_t size)27 int LLVMFuzzerTestOneInput(const uint8_t *src, size_t size)
28 {
29 size_t const neededBufSize = ZSTD_BLOCKSIZE_MAX;
30
31 FUZZ_seed(&src, &size);
32
33 /* Allocate all buffers and contexts if not already allocated */
34 if (neededBufSize > bufSize) {
35 free(rBuf);
36 rBuf = malloc(neededBufSize);
37 bufSize = neededBufSize;
38 FUZZ_ASSERT(rBuf);
39 }
40 if (!dctx) {
41 dctx = ZSTD_createDCtx();
42 FUZZ_ASSERT(dctx);
43 }
44 ZSTD_decompressBegin(dctx);
45 ZSTD_decompressBlock(dctx, rBuf, neededBufSize, src, size);
46
47 #ifndef STATEFUL_FUZZING
48 ZSTD_freeDCtx(dctx); dctx = NULL;
49 #endif
50 return 0;
51 }
52