lib/fuzzing/fuzz_lzxpress_huffman_decompress.c

   1 /*
   2    Fuzzing for lzxpress_decompress
   3    Copyright (C) Michael Hanselmann 2019
   4    Copyright (C) Douglas Bagnall 2022 <dbagnall@samba.org>
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "includes.h"
  21 #include "fuzzing/fuzzing.h"
  22 #include "compression/lzxpress_huffman.h"
  23
  24 int LLVMFuzzerInitialize(int *argc, char ***argv)
  25 {
  26         return 0;
  27 }
  28
  29 static uint8_t output[1024 * 1024] = {0};
  30
  31 int LLVMFuzzerTestOneInput(const uint8_t *buf, size_t len)
  32 {
  33         size_t target_len;
  34         if (len < 4) {
  35                 return 0;
  36         }
  37         /*
  38          * An exact target length is required, which we store in the first 24
  39          * bits.
  40          */
  41         target_len = MIN(sizeof(output), buf[0] | (buf[1] << 8) | (buf[2] << 16));
  42         buf += 3;
  43         len -= 3;
  44
  45         lzxpress_huffman_decompress(buf, len, output, target_len);
  46
  47         return 0;
  48 }