| /** |
| * 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" |
| |
| 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 = FUZZ_dataProducer_remainingBytes(producer); |
| |
| size_t const dstCapacity = FUZZ_getRange_from_uint32(dstCapacitySeed, 0, 4 * size); |
| size_t const smallDictSize = size + 1; |
| size_t const largeDictSize = 64 * 1024 - 1; |
| size_t const dictSize = MAX(smallDictSize, largeDictSize); |
| char* const dst = (char*)malloc(dstCapacity); |
| char* const dict = (char*)malloc(dictSize + size); |
| char* const largeDict = dict; |
| char* const dataAfterDict = dict + dictSize; |
| char* const smallDict = dataAfterDict - smallDictSize; |
| |
| FUZZ_ASSERT(dst); |
| FUZZ_ASSERT(dict); |
| |
| /* Prepare the dictionary. The data doesn't matter for decompression. */ |
| memset(dict, 0, dictSize); |
| memcpy(dataAfterDict, data, size); |
| |
| /* Decompress using each possible dictionary configuration. */ |
| /* No dictionary. */ |
| LZ4_decompress_safe_usingDict((char const*)data, dst, size, |
| dstCapacity, NULL, 0); |
| /* Small external dictonary. */ |
| LZ4_decompress_safe_usingDict((char const*)data, dst, size, |
| dstCapacity, smallDict, smallDictSize); |
| /* Large external dictionary. */ |
| LZ4_decompress_safe_usingDict((char const*)data, dst, size, |
| dstCapacity, largeDict, largeDictSize); |
| /* Small prefix. */ |
| LZ4_decompress_safe_usingDict((char const*)dataAfterDict, dst, size, |
| dstCapacity, smallDict, smallDictSize); |
| /* Large prefix. */ |
| LZ4_decompress_safe_usingDict((char const*)data, dst, size, |
| dstCapacity, largeDict, largeDictSize); |
| /* Partial decompression. */ |
| LZ4_decompress_safe_partial((char const*)data, dst, size, |
| dstCapacity, dstCapacity); |
| free(dst); |
| free(dict); |
| FUZZ_dataProducer_free(producer); |
| |
| return 0; |
| } |