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[3.10] bpo-46707: Avoid potential exponential backtracking in some syntax errors (GH-31241). (GH-31242)

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(cherry picked from commit b71dc71905)

Co-authored-by: Pablo Galindo Salgado <Pablogsal@gmail.com>
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Pablo Galindo Salgado 2022-02-10 03:54:47 +00:00 • committed by GitHub
parent 7445949a43
commit 9b23f8f78f
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4 changed files with 1298 additions and 1281 deletions
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8
Lib/test/test_syntax.py
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@ -1617,6 +1617,14 @@ def test_error_on_parser_stack_overflow(self):
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 test_main():
support.run_unittest(SyntaxTestCase)