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[3.9] bpo-46110: Add a recursion check to avoid stack overflow in the PEG parser (GH-30177) #30215

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Merged
merged 1 commit into from
Dec 20, 2021
Merged

[3.9] bpo-46110: Add a recursion check to avoid stack overflow in the PEG parser (GH-30177) #30215

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8 changes: 8 additions & 0 deletions Lib/test/test_syntax.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1004,6 +1004,14 @@ def test_syntax_error_on_deeply_nested_blocks(self):
"""
self._check_error(source, "too many statically nested blocks")

@support.cpython_only
def test_error_on_parser_stack_overflow(self):
source = "-" * 100000 + "4"
for mode in ["exec", "eval", "single"]:
with self.subTest(mode=mode):
with self.assertRaises(MemoryError):
compile(source, "<string>", mode)


def test_main():
support.run_unittest(SyntaxTestCase)
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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Core and Builtins/2021-12-18-02-37-07.bpo-46110.B6hAfu.rst
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@@ -0,0 +1,2 @@
Add a maximum recursion check to the PEG parser to avoid stack overflow.
Patch by Pablo Galindo
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