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gh-134119: Fix crash from calling next() on exhausted template iterator (#134120)

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Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>
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Jelle Zijlstra 2025-05-17 12:23:19 -07:00 • committed by GitHub
parent 84914ad0e5
commit fc7f4c3666
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3 changed files with 12 additions and 0 deletions
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7
Lib/test/test_string/test_templatelib.py
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@ -148,6 +148,13 @@ class TemplateIterTests(unittest.TestCase):
self.assertEqual(res[1].format_spec, '')
self.assertEqual(res[2], ' yz')
def test_exhausted(self):
# See https://github.com/python/cpython/issues/134119.
template_iter = iter(t"{1}")
self.assertIsInstance(next(template_iter), Interpolation)
self.assertRaises(StopIteration, next, template_iter)
self.assertRaises(StopIteration, next, template_iter)
if __name__ == '__main__':
unittest.main()

2
Misc/NEWS.d/next/Core_and_Builtins/2025-05-16-20-59-12.gh-issue-134119.w8expI.rst Normal file
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@ -0,0 +1,2 @@
Fix crash when calling :func:`next` on an exhausted template string iterator.
Patch by Jelle Zijlstra.

3
Objects/templateobject.c
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@ -23,6 +23,9 @@ templateiter_next(PyObject *op)
if (self->from_strings) {
item = PyIter_Next(self->stringsiter);
self->from_strings = 0;
if (item == NULL) {
return NULL;
}
if (PyUnicode_GET_LENGTH(item) == 0) {
Py_SETREF(item, PyIter_Next(self->interpolationsiter));
self->from_strings = 1;