bpo-25782: Prevent cycles in the __context__ chain. by serhiy-storchaka · Pull Request #20543

bpo-25782: Prevent cycles in the __context__ chain. by serhiy-storchaka · Pull Request #20543 · python/cpython

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Setting __context__ to self has no any effect. If set __context__ to the chain contained original exception, it is moved to the start of the context chain.

https://bugs.python.org/issue25782

Setting __context__ to self has no any effect.  If set
__context__ to the chain contained original exception, it is moved to
the start of the context chain.

Comment on lines +605 to +606

		If ctx is ex, the function has no any effect. If ex is in the
		context chain started from ctx, it is moved to the start of the chain.

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	If ctx is ex, the function has no any effect. If ex is in the
	context chain started from ctx, it is moved to the start of the chain.
	If ctx is ex, the function has no effect. If ex is in the
	context chain started from ctx, it is moved to the start of the chain.

Comment on lines +71 to +73

		Setting :attr:`__context__` to self has no any effect. If set
		``__context__`` to the chain contained original exception, it is moved to
		the start of the context chain.

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	Setting :attr:`__context__` to self has no any effect. If set
	``__context__`` to the chain contained original exception, it is moved to
	the start of the context chain.
	Setting :attr:`__context__` to self has no effect. If set
	``__context__`` to the chain contained an original exception, it is moved to
	the start of the context chain.

This missed the boat for inclusion in Python 3.9 which accepts security fixes only as of today.

1st1 mentioned this pull request

Apr 11, 2023

This PR is stale because it has been open for 30 days with no activity.

	If ctx is ex, the function has no any effect. If ex is in the
	context chain started from ctx, it is moved to the start of the chain.
	If ctx is ex, the function has no effect. If ex is in the
	context chain started from ctx, it is moved to the start of the chain.

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