summaryrefslogtreecommitdiff
path: root/Build/source/libs/libpng/libpng-src/contrib/oss-fuzz/newcc
blob: 0fc9e206c21b8c09674838723c489161ae968cdd (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
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190

// libpng_read_fuzzer.cc
// Copyright 2017 Glenn Randers-Pehrson
// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that may
// be found in the LICENSE file https://cs.chromium.org/chromium/src/LICENSE

// Last changed in libpng 1.6.33beta03 [September 27, 2017]

// The modifications in 2017 by Glenn Randers-Pehrson include
// 1. addition of a PNG_CLEANUP macro,
// 2. setting the option to ignore ADLER32 checksums,
// 3. adding "#include <string.h>" which is needed on some platforms
//    to provide memcpy().
// 4. adding read_end_info() and creating an end_info structure.

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

#include <vector>

#define PNG_INTERNAL
#include "png.h"

struct BufState {
  const uint8_t* data;
  size_t bytes_left;
};

struct PngObjectHandler {
  png_infop info_ptr = nullptr;
  png_structp png_ptr = nullptr;
  png_infop end_info_ptr = nullptr;
  png_voidp row_ptr = nullptr;
  BufState* buf_state = nullptr;

  ~PngObjectHandler() {
    if (row_ptr)
      png_free(png_ptr, row_ptr);
    if (end_info_ptr)
      png_destroy_read_struct(&png_ptr, &info_ptr, &end_info_ptr);
    else if (info_ptr) 
      png_destroy_read_struct(&png_ptr, &info_ptr, nullptr);
    else
      png_destroy_read_struct(&png_ptr, nullptr, nullptr);
    delete buf_state;
  }
};

void user_read_data(png_structp png_ptr, png_bytep data, png_size_t length) {
  BufState* buf_state = static_cast<BufState*>(png_get_io_ptr(png_ptr));
  if (length > buf_state->bytes_left) {
    png_error(png_ptr, "read error");
  }
  memcpy(data, buf_state->data, length);
  buf_state->bytes_left -= length;
  buf_state->data += length;
}

static const int kPngHeaderSize = 8;

// Entry point for LibFuzzer.
// Roughly follows the libpng book example:
// http://www.libpng.org/pub/png/book/chapter13.html

extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
  if (size < kPngHeaderSize) {
    return 0;
  }

  std::vector<unsigned char> v(data, data + size);
  if (png_sig_cmp(v.data(), 0, kPngHeaderSize)) {
    // not a PNG.
    return 0;
  }

  PngObjectHandler png_handler;
  png_handler.png_ptr = nullptr;
  png_handler.row_ptr = nullptr;
  png_handler.info_ptr = nullptr;
  png_handler.end_info_ptr = nullptr;

  png_handler.png_ptr = png_create_read_struct
    (PNG_LIBPNG_VER_STRING, nullptr, nullptr, nullptr);
  if (!png_handler.png_ptr) {
    return 0;
  }

#define PNG_CLEANUP \
  if(png_handler.png_ptr) \
  { \
    if (png_handler.row_ptr) \
      png_free(png_handler.png_ptr, png_handler.row_ptr); \
    if (png_handler.end_info_ptr) \
      png_destroy_read_struct(&png_handler.png_ptr, &png_handler.info_ptr,\
        &png_handler.end_info_ptr); \
    else if (png_handler.info_ptr) \
      png_destroy_read_struct(&png_handler.png_ptr, &png_handler.info_ptr,\
        nullptr); \
    else \
      png_destroy_read_struct(&png_handler.png_ptr, nullptr, nullptr); \
    png_handler.png_ptr = nullptr; \
    png_handler.row_ptr = nullptr; \
    png_handler.info_ptr = nullptr; \
    png_handler.end_info_ptr = nullptr; \
  }

  png_handler.info_ptr = png_create_info_struct(png_handler.png_ptr);
  if (!png_handler.info_ptr) {
    PNG_CLEANUP
    return 0;
  }

  png_handler.end_info_ptr = png_create_info_struct(png_handler.png_ptr);
  if (!png_handler.end_info_ptr) {
    PNG_CLEANUP
    return 0;
  }

  /* Treat benign errors as warnings */
  png_set_benign_errors(png_handler.png_ptr, 1);

  png_set_crc_action(png_handler.png_ptr, PNG_CRC_QUIET_USE, PNG_CRC_QUIET_USE);

#ifdef PNG_IGNORE_ADLER32
  png_set_option(png_handler.png_ptr, PNG_IGNORE_ADLER32, PNG_OPTION_ON);
#endif

  // Setting up reading from buffer.
  png_handler.buf_state = new BufState();
  png_handler.buf_state->data = data + kPngHeaderSize;
  png_handler.buf_state->bytes_left = size - kPngHeaderSize;
  png_set_read_fn(png_handler.png_ptr, png_handler.buf_state, user_read_data);
  png_set_sig_bytes(png_handler.png_ptr, kPngHeaderSize);

  if (setjmp(png_jmpbuf(png_handler.png_ptr))) {
    PNG_CLEANUP
    return 0;
  }

  // Reading.
  png_read_info(png_handler.png_ptr, png_handler.info_ptr);
  png_read_update_info(png_handler.png_ptr, png_handler.info_ptr);
  png_handler.row_ptr = png_malloc(
      png_handler.png_ptr, png_get_rowbytes(png_handler.png_ptr,
                                               png_handler.info_ptr));

  // reset error handler to put png_deleter into scope.
  if (setjmp(png_jmpbuf(png_handler.png_ptr))) {
    PNG_CLEANUP
    return 0;
  }

  png_uint_32 width, height;
  int bit_depth, color_type, interlace_type, compression_type;
  int filter_type;

  if (!png_get_IHDR(png_handler.png_ptr, png_handler.info_ptr, &width,
                    &height, &bit_depth, &color_type, &interlace_type,
                    &compression_type, &filter_type)) {
    PNG_CLEANUP
    return 0;
  }

  // This is going to be too slow.
  if (width && height > 100000000 / width) {
    PNG_CLEANUP
    return 0;
  }

  int passes = png_set_interlace_handling(png_handler.png_ptr);
  png_start_read_image(png_handler.png_ptr);

  /* To do: prevent the optimizer from removing this code entirely */
  for (int pass = 0; pass < passes; ++pass) {
    for (png_uint_32 y = 0; y < height; ++y) {
      png_read_row(png_handler.png_ptr,
                   static_cast<png_bytep>(png_handler.row_ptr), nullptr);
    }
  }

  png_read_end(png_handler.png_ptr, png_handler.end_info_ptr);

  PNG_CLEANUP

  /* TO do: exercise the progressive reader here */

  return 0;
}