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[3.11] gh-98433: Fix quadratic time idna decoding. (GH-99092) (#99222)

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There was an unnecessary quadratic loop in idna decoding. This restores
the behavior to linear.

(cherry picked from commit d315722564)

Co-authored-by: Gregory P. Smith <greg@krypto.org>
This commit is contained in:
Miss Islington (bot) 2022-11-07 18:57:10 -08:00 • committed by GitHub
parent 1add2393a8
commit a6f6c3a3d6
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3 changed files with 27 additions and 17 deletions
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6
Lib/test/test_codecs.py
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@ -1553,6 +1553,12 @@ class IDNACodecTest(unittest.TestCase):
self.assertEqual("pyth\xf6n.org".encode("idna"), b"xn--pythn-mua.org")
self.assertEqual("pyth\xf6n.org.".encode("idna"), b"xn--pythn-mua.org.")
def test_builtin_decode_length_limit(self):
with self.assertRaisesRegex(UnicodeError, "too long"):
(b"xn--016c"+b"a"*1100).decode("idna")
with self.assertRaisesRegex(UnicodeError, "too long"):
(b"xn--016c"+b"a"*70).decode("idna")
def test_stream(self):
r = codecs.getreader("idna")(io.BytesIO(b"abc"))
r.read(3)