summaryrefslogtreecommitdiffstats
path: root/other-licenses/snappy/src/snappy_uncompress_fuzzer.cc
blob: 385bfb5a336ca6eb38504a6c69fd4c9f4a605b58 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
// Copyright 2019 Google Inc. All Rights Reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//     * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// libFuzzer harness for fuzzing snappy's decompression code.

#include <stddef.h>
#include <stdint.h>

#include <cassert>
#include <string>

#include "snappy.h"

// Entry point for LibFuzzer.
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
  std::string input(reinterpret_cast<const char*>(data), size);

  // Avoid self-crafted decompression bombs.
  size_t uncompressed_size;
  constexpr size_t kMaxUncompressedSize = 1 << 20;
  bool get_uncompressed_length_succeeded = snappy::GetUncompressedLength(
      input.data(), input.size(), &uncompressed_size);
  if (!get_uncompressed_length_succeeded ||
      (uncompressed_size > kMaxUncompressedSize)) {
    return 0;
  }

  std::string uncompressed;
  // The return value of snappy::Uncompress() is ignored because decompression
  // will fail on invalid inputs.
  snappy::Uncompress(input.data(), input.size(), &uncompressed);
  return 0;
}