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merge bitcoin#18393: Don't assume presence of __builtin_mul_overflow in MultiplicationOverflow(...) fuzzing harness

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This commit is contained in:
Kittywhiskers Van Gogh 2020-03-20 16:15:17 +00:00
parent b50f00a2d5
commit bf04694e73
1 changed files with 14 additions and 1 deletions
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15
src/test/fuzz/multiplication_overflow.cpp
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@ -10,6 +10,14 @@
#include <string>
#include <vector>
#if defined(__has_builtin)
#if __has_builtin(__builtin_mul_overflow)
#define HAVE_BUILTIN_MUL_OVERFLOW
#endif
#elif defined(__GNUC__) && (__GNUC__ >= 5)
#define HAVE_BUILTIN_MUL_OVERFLOW
#endif
namespace {
template <typename T>
void TestMultiplicationOverflow(FuzzedDataProvider& fuzzed_data_provider)
@ -17,12 +25,18 @@ void TestMultiplicationOverflow(FuzzedDataProvider& fuzzed_data_provider)
const T i = fuzzed_data_provider.ConsumeIntegral<T>();
const T j = fuzzed_data_provider.ConsumeIntegral<T>();
const bool is_multiplication_overflow_custom = MultiplicationOverflow(i, j);
#if defined(HAVE_BUILTIN_MUL_OVERFLOW)
T result_builtin;
const bool is_multiplication_overflow_builtin = __builtin_mul_overflow(i, j, &result_builtin);
assert(is_multiplication_overflow_custom == is_multiplication_overflow_builtin);
if (!is_multiplication_overflow_custom) {
assert(i * j == result_builtin);
}
#else
if (!is_multiplication_overflow_custom) {
(void)(i * j);
}
#endif
}
} // namespace
@ -38,5 +52,4 @@ void test_one_input(const std::vector<uint8_t>& buffer)
TestMultiplicationOverflow<char>(fuzzed_data_provider);
TestMultiplicationOverflow<unsigned char>(fuzzed_data_provider);
TestMultiplicationOverflow<signed char>(fuzzed_data_provider);
TestMultiplicationOverflow<bool>(fuzzed_data_provider);
}