diff options
| author | Pablo Galindo Salgado <Pablogsal@gmail.com> | 2022-02-10 03:37:17 (GMT) |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2022-02-10 03:37:17 (GMT) |
| commit | b71dc71905ab674ccaa4a56230d17a28f61c325c (patch) | |
| tree | ec6148ebc665d0beecc006afd4f6fea6b7139b9a /Lib/test/test_syntax.py | |
| parent | cb68788dcadf43b47292bab7816a5ed9efa69730 (diff) | |
| download | cpython-b71dc71905ab674ccaa4a56230d17a28f61c325c.zip cpython-b71dc71905ab674ccaa4a56230d17a28f61c325c.tar.gz cpython-b71dc71905ab674ccaa4a56230d17a28f61c325c.tar.bz2 | |
bpo-46707: Avoid potential exponential backtracking in some syntax errors (GH-31241)
Diffstat (limited to 'Lib/test/test_syntax.py')
| -rw-r--r-- | Lib/test/test_syntax.py | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/Lib/test/test_syntax.py b/Lib/test/test_syntax.py index a6ff319..8ddfe91 100644 --- a/Lib/test/test_syntax.py +++ b/Lib/test/test_syntax.py @@ -1770,6 +1770,14 @@ while 1: with self.assertRaises(MemoryError): compile(source, "<string>", mode) + @support.cpython_only + def test_deep_invalid_rule(self): + # Check that a very deep invalid rule in the PEG + # parser doesn't have exponential backtracking. + source = "d{{{{{{{{{{{{{{{{{{{{{{{{{```{{{{{{{ef f():y" + with self.assertRaises(SyntaxError): + compile(source, "<string>", "exec") + def load_tests(loader, tests, pattern): tests.addTest(doctest.DocTestSuite()) |