[issue2586] Integer signedness bugs in zlib modules

[David Remahl]

David Remahl <chmod007 at users.sourceforge.net> added the comment:

I submit that a check for negative values (non-assert-based) should be 
added to PyString_FromStringAndSize(). This API is called from many, many 
places, and in several cases the operand could probably be negative. It 
should raise an overflow exception for a negative value.

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nosy: +chmod007

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