[issue12837] Patch for issue #12810 removed a valid check on socket ancillary data

[David Watson]

David Watson added the comment:

Looking again at cmsg_min_space(), I see that it already returns
false when msg_controllen is less than cmsg_len_end, so you could
do a (signed) comparison against that, rather than 0.  Patch
attached.

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Added file: http://bugs.python.org/file32992/socket-compare-cmsg_len_end.diff

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