I'm no C expert at all, but it appears to me that 1.55-1ubuntu1 is not affected:
 - w_read in policyd.c uses MAXLINE for length already
 - the sanity check in sockets.c does not seem to apply for sockets.c in 1.55 
(http://svn.linuxrulz.org/WebSVN/diff.php?repname=Policyd&path=%2Ftrunk%2Fsockets.c&rev=4&sc=1)

Please double-check my investigations!

** Changed in: postfix-policyd (Ubuntu Dapper)
       Status: New => Incomplete

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buffer overflow in w_read function (possible DoS and execution of arbitary code)
https://bugs.launchpad.net/bugs/136687
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