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bpo-11105: Do not crash when compiling recursive ASTs (GH-20594)

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When compiling an AST object with a direct / indirect reference
cycles, on the conversion phase because of exceeding amount of
calls, a segfault was raised. This patch adds recursion guards to
places for preventing user inputs to not to crash AST but instead
raise a RecursionError.
This commit is contained in:
Batuhan Taskaya 2021-06-03 23:01:02 +03:00 • committed by GitHub
parent f461a7fc3f
commit f3491242e4
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4 changed files with 840 additions and 4 deletions
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14
Lib/test/test_ast.py
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@ -1098,6 +1098,20 @@ Module(
exec(code, ns)
self.assertIn('sleep', ns)
def test_recursion_direct(self):
e = ast.UnaryOp(op=ast.Not(), lineno=0, col_offset=0)
e.operand = e
with self.assertRaises(RecursionError):
compile(ast.Expression(e), "<test>", "eval")
def test_recursion_indirect(self):
e = ast.UnaryOp(op=ast.Not(), lineno=0, col_offset=0)
f = ast.UnaryOp(op=ast.Not(), lineno=0, col_offset=0)
e.operand = f
f.operand = e
with self.assertRaises(RecursionError):
compile(ast.Expression(e), "<test>", "eval")
class ASTValidatorTests(unittest.TestCase):