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attempt to fix #1445, flush buffer in serializer::dump_escaped in UTF8_REJECT case. #1446

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merged 3 commits into from
Jan 20, 2019
Merged

attempt to fix #1445, flush buffer in serializer::dump_escaped in UTF8_REJECT case. #1446

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899bd94
flush buffer in serializer::dump_escaped case UTF8_REJECT
scinart Jan 19, 2019
83e8444
fix typo
scinart Jan 19, 2019
20db020
move newly-added tests in unit-regression.cpp
scinart Jan 19, 2019
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10 changes: 10 additions & 0 deletions include/nlohmann/detail/output/serializer.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -454,6 +454,16 @@ class serializer
string_buffer[bytes++] = detail::binary_writer<BasicJsonType, char>::to_char_type('\xBF');
string_buffer[bytes++] = detail::binary_writer<BasicJsonType, char>::to_char_type('\xBD');
}

// write buffer and reset index; there must be 13 bytes
// left, as this is the maximal number of bytes to be
// written ("\uxxxx\uxxxx\0") for one code point
if (string_buffer.size() - bytes < 13)
{
o->write_characters(string_buffer.data(), bytes);
bytes = 0;
}

bytes_after_last_accept = bytes;
}

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10 changes: 10 additions & 0 deletions single_include/nlohmann/json.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -11344,6 +11344,16 @@ class serializer
string_buffer[bytes++] = detail::binary_writer<BasicJsonType, char>::to_char_type('\xBF');
string_buffer[bytes++] = detail::binary_writer<BasicJsonType, char>::to_char_type('\xBD');
}

// write buffer and reset index; there must be 13 bytes
// left, as this is the maximal number of bytes to be
// written ("\uxxxx\uxxxx\0") for one code point
if (string_buffer.size() - bytes < 13)
{
o->write_characters(string_buffer.data(), bytes);
bytes = 0;
}

bytes_after_last_accept = bytes;
}

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61 changes: 61 additions & 0 deletions test/src/unit-regression.cpp
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Expand Up @@ -1708,6 +1708,67 @@ TEST_CASE("regression tests")
const auto data = j.get<decltype(expected)>();
CHECK(expected == data);
}

SECTION("issue #1445 - buffer overflow in dumping invalid utf-8 strings")
{
SECTION("a bunch of -1, ensure_ascii=true")
{
json dump_test;
std::vector<char> data(300, -1);
std::vector<std::string> vec_string(300, "\\ufffd");
std::string s{data.data(), data.size()};
dump_test["1"] = s;
std::ostringstream os;
os << "{\"1\":\"";
std::copy( vec_string.begin(), vec_string.end(), std::ostream_iterator<std::string>(os));
os << "\"}";
s = dump_test.dump(-1, ' ', true, nlohmann::json::error_handler_t::replace);
CHECK(s == os.str());
}
SECTION("a bunch of -2, ensure_ascii=false")
{
json dump_test;
std::vector<char> data(500, -2);
std::vector<std::string> vec_string(500, "\xEF\xBF\xBD");
std::string s{data.data(), data.size()};
dump_test["1"] = s;
std::ostringstream os;
os << "{\"1\":\"";
std::copy( vec_string.begin(), vec_string.end(), std::ostream_iterator<std::string>(os));
os << "\"}";
s = dump_test.dump(-1, ' ', false, nlohmann::json::error_handler_t::replace);
CHECK(s == os.str());
}
SECTION("test case in issue #1445")
{
nlohmann::json dump_test;
const int data[] = {
109, 108, 103, 125, -122, -53, 115,
18, 3, 0, 102, 19, 1, 15,
-110, 13, -3, -1, -81, 32, 2,
0, 0, 0, 0, 0, 0, 0,
8, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, -80, 2,
0, 0, 96, -118, 46, -116, 46,
109, -84, -87, 108, 14, 109, -24,
-83, 13, -18, -51, -83, -52, -115,
14, 6, 32, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0,
64, 3, 0, 0, 0, 35, -74,
-73, 55, 57, -128, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0,
0, 0, 33, 0, 0, 0, -96,
-54, -28, -26
};
std::string s;
for (int i=0; i<sizeof(data)/sizeof(int); i++)
{
s += static_cast<char>(data[i]);
}
dump_test["1"] = s;
dump_test.dump(-1, ' ', true, nlohmann::json::error_handler_t::replace);
}
}
}

TEST_CASE("regression tests, exceptions dependent", "[!throws]")
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