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This differs from fuzz_lzxpress_huffman_round_trip (next commit) in that the output buffer might be too small for the compressed data, in which case we want to see an error and not a crash. Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz> Reviewed-by: Joseph Sutton <josephsutton@catalyst.net.nz>
59 lines
1.6 KiB
C
59 lines
1.6 KiB
C
/*
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Fuzzing for lzxpress_huffman_compress_talloc
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Copyright (C) Michael Hanselmann 2019
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Copyright (C) Douglas Bagnall 2022 <dbagnall@samba.org>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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#include "fuzzing/fuzzing.h"
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#include "compression/lzxpress_huffman.h"
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int LLVMFuzzerInitialize(int *argc, char ***argv)
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{
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return 0;
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}
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#define MAX_SIZE (1024 * 1024)
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int LLVMFuzzerTestOneInput(uint8_t *buf, size_t len)
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{
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static uint8_t *output;
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size_t output_len;
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TALLOC_CTX *mem_ctx = NULL;
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struct lzxhuff_compressor_mem cmp_mem;
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/*
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* The round-trip fuzzer checks the compressor with an unconstrained
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* output buffer; here we see what happens if the buffer is possibly too
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* small.
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*/
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if (len < 3) {
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return 0;
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}
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output_len = MIN(MAX_SIZE, buf[0] | (buf[1] << 8) | (buf[2] << 16));
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buf += 3;
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len -= 3;
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mem_ctx = talloc_new(NULL);
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output = talloc_array(mem_ctx, uint8_t, output_len);
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lzxpress_huffman_compress(&cmp_mem, buf, len, output, output_len);
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talloc_free(mem_ctx);
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return 0;
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}
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