Line data    Source code

       1             : // Copyright (c) 2020-2021 The Bitcoin Core developers
       2             : // Distributed under the MIT software license, see the accompanying
       3             : // file COPYING or http://www.opensource.org/licenses/mit-license.php.
       4             : 
       5             : #if defined(HAVE_CONFIG_H)
       6             : #include <config/bitcoin-config.h>
       7             : #endif
       8             : 
       9             : #include <test/fuzz/FuzzedDataProvider.h>
      10             : #include <test/fuzz/fuzz.h>
      11             : #include <test/fuzz/util.h>
      12             : 
      13             : #include <cstdint>
      14             : #include <string>
      15             : #include <vector>
      16             : 
      17             : namespace {
      18             : template <typename T>
      19           0 : void TestMultiplicationOverflow(FuzzedDataProvider& fuzzed_data_provider)
      20             : {
      21           0 :     const T i = fuzzed_data_provider.ConsumeIntegral<T>();
      22           0 :     const T j = fuzzed_data_provider.ConsumeIntegral<T>();
      23           0 :     const bool is_multiplication_overflow_custom = MultiplicationOverflow(i, j);
      24             : #if defined(HAVE_BUILTIN_MUL_OVERFLOW)
      25           2 :     T result_builtin;
      26           0 :     const bool is_multiplication_overflow_builtin = __builtin_mul_overflow(i, j, &result_builtin);
      27           0 :     assert(is_multiplication_overflow_custom == is_multiplication_overflow_builtin);
      28           0 :     if (!is_multiplication_overflow_custom) {
      29           0 :         assert(i * j == result_builtin);
      30           0 :     }
      31             : #else
      32             :     if (!is_multiplication_overflow_custom) {
      33             :         (void)(i * j);
      34             :     }
      35             : #endif
      36           0 : }
      37             : } // namespace
      38             : 
      39           4 : FUZZ_TARGET(multiplication_overflow)
      40             : {
      41           0 :     FuzzedDataProvider fuzzed_data_provider(buffer.data(), buffer.size());
      42           0 :     TestMultiplicationOverflow<int64_t>(fuzzed_data_provider);
      43           0 :     TestMultiplicationOverflow<uint64_t>(fuzzed_data_provider);
      44           0 :     TestMultiplicationOverflow<int32_t>(fuzzed_data_provider);
      45           0 :     TestMultiplicationOverflow<uint32_t>(fuzzed_data_provider);
      46           0 :     TestMultiplicationOverflow<int16_t>(fuzzed_data_provider);
      47           0 :     TestMultiplicationOverflow<uint16_t>(fuzzed_data_provider);
      48           0 :     TestMultiplicationOverflow<char>(fuzzed_data_provider);
      49           0 :     TestMultiplicationOverflow<unsigned char>(fuzzed_data_provider);
      50           0 :     TestMultiplicationOverflow<signed char>(fuzzed_data_provider);
      51           0 : }