[issue17710] SystemError in cPickle for incorrect input

[Antoine Pitrou]

Antoine Pitrou added the comment:

Alexandre, I don't like your patch very much:
- you are changing the exception from ValueError to UnpicklingError (which doesn't derive from ValueError) in a bugfix release
- you aren't actually adding any guards in the C code, so it's not demonstrably more robust

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<http://bugs.python.org/issue17710>
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