lib/fuzzing/fuzz_lzxpress_huffman_compress.c

   1 /*
   2    Fuzzing for lzxpress_huffman_compress_talloc
   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
  30 #define MAX_SIZE (1024 * 1024)
  31
  32 int LLVMFuzzerTestOneInput(const uint8_t *buf, size_t len)
  33 {
  34         static uint8_t *output;
  35         size_t output_len;
  36         TALLOC_CTX *mem_ctx = NULL;
  37         struct lzxhuff_compressor_mem cmp_mem;
  38
  39         /*
  40          * The round-trip fuzzer checks the compressor with an unconstrained
  41          * output buffer; here we see what happens if the buffer is possibly too
  42          * small.
  43          */
  44         if (len < 3) {
  45                 return 0;
  46         }
  47         output_len = MIN(MAX_SIZE, buf[0] | (buf[1] << 8) | (buf[2] << 16));
  48         buf += 3;
  49         len -= 3;
  50         mem_ctx = talloc_new(NULL);
  51
  52         output = talloc_array(mem_ctx, uint8_t, output_len);
  53
  54         lzxpress_huffman_compress(&cmp_mem, buf, len, output, output_len);
  55
  56         talloc_free(mem_ctx);
  57         return 0;
  58 }