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bpo-44822: Don't truncate strs with embedded NULL chars returned by sqlite3 UDF callbacks #27588

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Merged
merged 8 commits into from
Aug 5, 2021
Merged

bpo-44822: Don't truncate strs with embedded NULL chars returned by sqlite3 UDF callbacks #27588

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2241795
bpo-44822: Pass string size to sqlite3_result_text()
Aug 3, 2021
58d3244
Raise OverflowError if size > INT_MAX
Aug 4, 2021
73639f1
Add test
Aug 4, 2021
60d94f9
Add NEWS entry
Aug 4, 2021
10fbc4b
Don't capitalize error string
Aug 4, 2021
a483052
Add aggregate test
Aug 4, 2021
55963ca
Address review: reword NEWS entry
Aug 4, 2021
7a2c279
Apply suggestions from code review
serhiy-storchaka Aug 5, 2021
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9 changes: 9 additions & 0 deletions Lib/sqlite3/test/userfunctions.py
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Original file line number Diff line number Diff line change
Expand Up @@ -53,6 +53,8 @@ def wrapper(self, *args, **kwargs):

def func_returntext():
return "foo"
def func_returntextwithnull():
return "1\x002"
def func_returnunicode():
return "bar"
def func_returnint():
Expand Down Expand Up @@ -168,6 +170,7 @@ def setUp(self):
self.con = sqlite.connect(":memory:")

self.con.create_function("returntext", 0, func_returntext)
self.con.create_function("returntextwithnull", 0, func_returntextwithnull)
self.con.create_function("returnunicode", 0, func_returnunicode)
self.con.create_function("returnint", 0, func_returnint)
self.con.create_function("returnfloat", 0, func_returnfloat)
Expand Down Expand Up @@ -211,6 +214,12 @@ def test_func_return_text(self):
self.assertEqual(type(val), str)
self.assertEqual(val, "foo")

def test_func_return_text_with_null_char(self):
cur = self.con.cursor()
res = cur.execute("select returntextwithnull()").fetchone()[0]
self.assertEqual(type(res), str)
self.assertEqual(res, "1\x002")

def test_func_return_unicode(self):
cur = self.con.cursor()
cur.execute("select returnunicode()")
Expand Down
3 changes: 3 additions & 0 deletions Misc/NEWS.d/next/Library/2021-08-04-12-29-00.bpo-44822.zePNXA.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,3 @@
:mod:`sqlite3` now raises :exc:`OverflowError` if an user-defined function
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@serhiy-storchaka serhiy-storchaka Aug 4, 2021

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Actually sqlite3 overwrites OverflowError with other exception. But it does not matter, the most important part of this PR is that result strings with NUL are now correctly supported.

Something like (please correct my English):

Suggested change
:mod:`sqlite3` now raises :exc:`OverflowError` if an user-defined function
Fix support of user functions and aggregates returning string containing NUL in :mod:`sqlite3`.

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@erlend-aasland erlend-aasland Aug 4, 2021

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Actually sqlite3 overwrites OverflowError with other exception.

Ah, yes, there should be some exception chaining in the UDF callbacks. I'll open an issue for it.

Anyway, how does the reworded NEWS entry look?

returns a :class:`str` larger than ``INT_MAX`` bytes. Patch by Erlend E.
Aasland.
13 changes: 10 additions & 3 deletions Modules/_sqlite/connection.c
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Expand Up @@ -519,10 +519,17 @@ _pysqlite_set_result(sqlite3_context* context, PyObject* py_val)
} else if (PyFloat_Check(py_val)) {
sqlite3_result_double(context, PyFloat_AsDouble(py_val));
} else if (PyUnicode_Check(py_val)) {
const char *str = PyUnicode_AsUTF8(py_val);
if (str == NULL)
Py_ssize_t sz;
const char *str = PyUnicode_AsUTF8AndSize(py_val, &sz);
if (str == NULL) {
return -1;
sqlite3_result_text(context, str, -1, SQLITE_TRANSIENT);
}
if (sz > INT_MAX) {
PyErr_SetString(PyExc_OverflowError,
"string is longer than INT_MAX bytes");
return -1;
}
sqlite3_result_text(context, str, (int)sz, SQLITE_TRANSIENT);
} else if (PyObject_CheckBuffer(py_val)) {
Py_buffer view;
if (PyObject_GetBuffer(py_val, &view, PyBUF_SIMPLE) != 0) {
Expand Down