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/**
* This fuzz target attempts to decompress the fuzzed data with the simple
* decompression function to ensure the decompressor never crashes.
*/
#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "fuzz_helpers.h"
#include "fuzz_data_producer.h"
#include "lz4.h"
#define LZ4F_STATIC_LINKING_ONLY
#include "lz4frame.h"
#include "lz4_helpers.h"
static void decompress(LZ4F_dctx* dctx, void* dst, size_t dstCapacity,
const void* src, size_t srcSize,
const void* dict, size_t dictSize,
const LZ4F_decompressOptions_t* opts)
{
LZ4F_resetDecompressionContext(dctx);
if (dictSize == 0)
LZ4F_decompress(dctx, dst, &dstCapacity, src, &srcSize, opts);
else
LZ4F_decompress_usingDict(dctx, dst, &dstCapacity, src, &srcSize,
dict, dictSize, opts);
}
int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
{
FUZZ_dataProducer_t *producer = FUZZ_dataProducer_create(data, size);
size_t const dstCapacitySeed = FUZZ_dataProducer_retrieve32(producer);
size_t const dictSizeSeed = FUZZ_dataProducer_retrieve32(producer);
size = FUZZ_dataProducer_remainingBytes(producer);
size_t const dstCapacity = FUZZ_getRange_from_uint32(
dstCapacitySeed, 0, 4 * size);
size_t const largeDictSize = 64 * 1024;
size_t const dictSize = FUZZ_getRange_from_uint32(
dictSizeSeed, 0, largeDictSize);
char* const dst = (char*)malloc(dstCapacity);
char* const dict = (char*)malloc(dictSize);
LZ4F_decompressOptions_t opts;
LZ4F_dctx* dctx;
LZ4F_createDecompressionContext(&dctx, LZ4F_VERSION);
FUZZ_ASSERT(dctx);
FUZZ_ASSERT(dst);
FUZZ_ASSERT(dict);
/* Prepare the dictionary. The data doesn't matter for decompression. */
memset(dict, 0, dictSize);
/* Decompress using multiple configurations. */
memset(&opts, 0, sizeof(opts));
opts.stableDst = 0;
decompress(dctx, dst, dstCapacity, data, size, NULL, 0, &opts);
opts.stableDst = 1;
decompress(dctx, dst, dstCapacity, data, size, NULL, 0, &opts);
opts.stableDst = 0;
decompress(dctx, dst, dstCapacity, data, size, dict, dictSize, &opts);
opts.stableDst = 1;
decompress(dctx, dst, dstCapacity, data, size, dict, dictSize, &opts);
LZ4F_freeDecompressionContext(dctx);
free(dst);
free(dict);
FUZZ_dataProducer_free(producer);
return 0;
}
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