[issue6697] Python 3.1 segfaults when invalid UTF-8 characters are passed from command line

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

The problem is actually wider::
    >>> getattr(None, "\udc80")
    Segmentation fault
An idea would be to change _PyUnicode_AsDefaultEncodedString and allow
unpaired surrogates (utf8+surrogateescape, as explained in PEP383), but
I fear the consequences...

The code that fails seems pretty common:
	PyErr_Format(PyExc_AttributeError,
		     "'%.50s' object has no attribute '%.400s'",
		     tp->tp_name, _PyUnicode_AsString(name));
It would be unfortunate to replace all usages of _PyUnicode_AsString to
check the return value.

Martin, what do you think?

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nosy: +amaury.forgeotdarc, loewis

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