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gh-156100: Fix crashes in the sqlite3 Connection.autocommit setter #156104

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Merged
serhiy-storchaka merged 3 commits into from
Aug 21, 2026
Merged

gh-156100: Fix crashes in the sqlite3 Connection.autocommit setter #156104

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2cf1c76
gh-156100: Fix a crash when deleting sqlite3 Connection.autocommit
serhiy-storchaka Aug 20, 2026
5af0c34
Check that a failed deletion does not change the value
serhiy-storchaka Aug 20, 2026
3b4b844
Fix setting autocommit to an out of range integer
serhiy-storchaka Aug 20, 2026
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gh-156100: Fix a crash when deleting sqlite3 Connection.autocommit 
The setter passed the deleted value to autocommit_converter(), which
dereferences it.
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@serhiy-storchaka
serhiy-storchaka committed Aug 20, 2026
commit 2cf1c76a7076f909f463ffc5cc5b6c59ba6e3be6
7 changes: 7 additions & 0 deletions Lib/test/test_sqlite3/test_transactions.py
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Original file line number Diff line number Diff line change
Expand Up @@ -394,6 +394,13 @@ def test_autocommit_setget_invalid(self):
with self.assertRaisesRegex(ValueError, msg):
sqlite.connect(":memory:", autocommit=mode)

def test_autocommit_delete(self):
with memory_database() as cx:
with self.assertRaisesRegex(AttributeError,
"cannot delete autocommit attribute"):
del cx.autocommit
self.assertEqual(cx.autocommit, sqlite.LEGACY_TRANSACTION_CONTROL)

def test_autocommit_disabled(self):
expected = [
"SELECT 1",
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3 changes: 3 additions & 0 deletions Misc/NEWS.d/next/Library/2026-08-20-12-05-00.gh-issue-156100.Lm7qWz.rst
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@@ -0,0 +1,3 @@
Fix a crash when deleting the :attr:`~sqlite3.Connection.autocommit`
attribute of :class:`sqlite3.Connection`.
It now raises :exc:`AttributeError`.
5 changes: 5 additions & 0 deletions Modules/_sqlite/connection.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2621,6 +2621,11 @@ static int
set_autocommit(PyObject *op, PyObject *val, void *Py_UNUSED(closure))
{
pysqlite_Connection *self = _pysqlite_Connection_CAST(op);
if (val == NULL) {
PyErr_SetString(PyExc_AttributeError,
"cannot delete autocommit attribute");
return -1;
}
if (!pysqlite_check_thread(self) || !pysqlite_check_connection(self)) {
return -1;
}
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