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fix: unicode surrogate character in Python exception message. (#4297)

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* Fix & test for issue #4288 (unicode surrogate character in Python exception message).

* DRY `message_unavailable_exc`

* fix: add a constexpr

Co-authored-by: Aaron Gokaslan <skylion.aaron@gmail.com>

* style: pre-commit fixes

Co-authored-by: Henry Schreiner <HenrySchreinerIII@gmail.com>
Co-authored-by: Aaron Gokaslan <skylion.aaron@gmail.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
This commit is contained in:
Ralf W. Grosse-Kunstleve 2022-10-31 09:18:05 -07:00 committed by Henry Schreiner
parent 15fde1def2
commit 3fb36a99f6
3 changed files with 34 additions and 7 deletions
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22
include/pybind11/pytypes.h
View File

@ -501,11 +501,29 @@ struct error_fetch_and_normalize {
std::string message_error_string;
if (m_value) {
auto value_str = reinterpret_steal<object>(PyObject_Str(m_value.ptr()));
constexpr const char *message_unavailable_exc
= "<MESSAGE UNAVAILABLE DUE TO ANOTHER EXCEPTION>";
if (!value_str) {
message_error_string = detail::error_string();
result = "<MESSAGE UNAVAILABLE DUE TO ANOTHER EXCEPTION>";
result = message_unavailable_exc;
} else {
result = value_str.cast<std::string>();
// Not using `value_str.cast<std::string>()`, to not potentially throw a secondary
// error_already_set that will then result in process termination (#4288).
auto value_bytes = reinterpret_steal<object>(
PyUnicode_AsEncodedString(value_str.ptr(), "utf-8", "backslashreplace"));
if (!value_bytes) {
message_error_string = detail::error_string();
result = message_unavailable_exc;
} else {
char *buffer = nullptr;
Py_ssize_t length = 0;
if (PyBytes_AsStringAndSize(value_bytes.ptr(), &buffer, &length) == -1) {
message_error_string = detail::error_string();
result = message_unavailable_exc;
} else {
result = std::string(buffer, static_cast<std::size_t>(length));
}
}
}
} else {
result = "<MESSAGE UNAVAILABLE>";

5
tests/test_exceptions.cpp
View File

@ -105,11 +105,6 @@ struct PythonAlreadySetInDestructor {
py::str s;
};
std::string error_already_set_what(const py::object &exc_type, const py::object &exc_value) {
PyErr_SetObject(exc_type.ptr(), exc_value.ptr());
return py::error_already_set().what();
}
TEST_SUBMODULE(exceptions, m) {
m.def("throw_std_exception",
[]() { throw std::runtime_error("This exception was intentionally thrown."); });

14
tests/test_exceptions.py
View File

@ -275,6 +275,20 @@ def test_local_translator(msg):
assert msg(excinfo.value) == "this mod"
def test_error_already_set_message_with_unicode_surrogate(): # Issue #4288
assert m.error_already_set_what(RuntimeError, "\ud927") == (
"RuntimeError: \\ud927",
False,
)
def test_error_already_set_message_with_malformed_utf8():
assert m.error_already_set_what(RuntimeError, b"\x80") == (
"RuntimeError: b'\\x80'",
False,
)
class FlakyException(Exception):
def __init__(self, failure_point):
if failure_point == "failure_point_init":