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Update fuzzer.cpp Improve Memory Safety and Optimize String Handling in Fuzzer #12816

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24 changes: 13 additions & 11 deletions projects/rapidjson/fuzzer.cpp
Original file line number Diff line number Diff line change
Expand Up @@ -23,30 +23,32 @@ extern "C" {
#endif

template<unsigned parseFlags>
void fuzzWithFlags(const std::string &s)
{
/* Parse input to rapidjson::Document */
void fuzzWithFlags(const std::string &s) {
rapidjson::Document document;
rapidjson::ParseResult pr = document.Parse<parseFlags>(s.c_str());
if ( !pr ) {
if (!pr) {
return;
}

/* Convert from rapidjson::Document to string */
rapidjson::StringBuffer sb;
rapidjson::PrettyWriter<rapidjson::StringBuffer> writer(sb);
document.Accept(writer);
std::string str = sb.GetString();
std::string_view result(sb.GetString(), sb.GetSize());

#ifdef MSAN
if ( str.size() ) {
__msan_check_mem_is_initialized(str.data(), str.size());
if (!result.empty()) {
__msan_check_mem_is_initialized(result.data(), result.size());
}
#endif
}

extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
{
const std::string s(data, data + size);
extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
if (size == 0) {
return 0;
}

// Ensure the input is null-terminated by copying it into a std::string
std::string s(reinterpret_cast<const char*>(data), size);

fuzzWithFlags<rapidjson::kParseDefaultFlags>(s);
fuzzWithFlags<rapidjson::kParseFullPrecisionFlag>(s);
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