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bpo-25532: Protect against infinite loops in inspect.unwrap() #1717

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Merged
ncoghlan merged 5 commits into from
May 23, 2017
Merged

bpo-25532: Protect against infinite loops in inspect.unwrap() #1717

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e0d4789
Protect against infinite loops in inspect.unwrap()
takluyver May 22, 2017
87c0c0e
Add note about bpo-25532 in NEWS
takluyver May 22, 2017
2cb0a18
Add test for infinite loop protection in inspect.unwrap()
takluyver May 22, 2017
b12a0ac
Change memo set to a dict
takluyver May 22, 2017
553df25
Use len(memo) instead of a separate unwrap_count
takluyver May 22, 2017
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Add test for infinite loop protection in inspect.unwrap()
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@takluyver
takluyver committed May 22, 2017
commit 2cb0a18450ef5e634123eb4539cc24961a1e02e7
18 changes: 18 additions & 0 deletions Lib/test/test_inspect.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3554,6 +3554,19 @@ def test_builtins_have_signatures(self):
self.assertIsNone(obj.__text_signature__)


class NTimesUnwrappable:
def __init__(self, n):
self.n = n
self._next = None

@property
def __wrapped__(self):
if self.n <= 0:
raise Exception("Unwrapped too many times")
if self._next is None:
self._next = NTimesUnwrappable(self.n - 1)
return self._next

class TestUnwrap(unittest.TestCase):

def test_unwrap_one(self):
Expand Down Expand Up @@ -3609,6 +3622,11 @@ class C:
__wrapped__ = func
self.assertIsNone(inspect.unwrap(C()))

def test_recursion_limit(self):
obj = NTimesUnwrappable(sys.getrecursionlimit() + 1)
with self.assertRaisesRegex(ValueError, 'wrapper loop'):
inspect.unwrap(obj)

class TestMain(unittest.TestCase):
def test_only_source(self):
module = importlib.import_module('unittest')
Expand Down