| /** |
| * 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; |
| } |