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gh-132171: Fix _interpreters.run_string crash on string subclass #132173

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Merged
merged 1 commit into from
Apr 7, 2025
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gh-132171: Fix _interpreters.run_string crash on string subclass #132173

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6 changes: 6 additions & 0 deletions Lib/test/test__interpreters.py
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Original file line number Diff line number Diff line change
Expand Up @@ -746,6 +746,12 @@ def test_bytes_for_script(self):
with self.assertRaises(TypeError):
_interpreters.run_string(self.id, b'print("spam")')

def test_str_subclass_string(self):
class StrSubclass(str): pass

output = _run_output(self.id, StrSubclass('print(1 + 2)'))
self.assertEqual(output, '3\n')

def test_with_shared(self):
r, w = os.pipe()

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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Library/2025-04-06-23-09-21.gh-issue-132171.zZqvfn.rst
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@@ -0,0 +1 @@
Fix crash of ``_interpreters.run_string`` on string subclasses.
2 changes: 1 addition & 1 deletion Modules/_interpretersmodule.c
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Expand Up @@ -330,7 +330,7 @@ get_code_str(PyObject *arg, Py_ssize_t *len_p, PyObject **bytes_p, int *flags_p)
int flags = 0;

if (PyUnicode_Check(arg)) {
assert(PyUnicode_CheckExact(arg)
assert(PyUnicode_Check(arg)
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check is already happening in the if condition, then why do the check again? Shouldn't we remove it?

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In hindsight, sure. But I don't think it's worth changing it now; it's not wrong, it's just redundant.

&& (check_code_str((PyUnicodeObject *)arg) == NULL));
codestr = PyUnicode_AsUTF8AndSize(arg, &len);
if (codestr == NULL) {
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