ceph/src/zstd/tests/fuzz/block_decompress.c

   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
  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 }