python 2.2.2 or cvs, platform any

binascii.a2b_base64 allocates buffer for data at
startup, at end data it truncated to decoded size if it
is bigger than 0, but what about invalid data where
every character is non base64 - space, \r,\n ?

Buffer remains allocated to bin_len but resulting data
length is 0 and it isnt truncated as random data will
be returned

demo.py
import base64
data = '\n'
result = base64.decodestring(data)
print map(ord,result)

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This problem appears to be fixed in Python 2.3+.