[Bug 1204530] Re: yppasswd results in a segmentation fault when run on clients or server

[ChristianEhrhardt]

[Impact]

 * The bug is a segfault on yppasswd rendering users unable to change their passwords
 * justification for the SRU is the continued request by users and the fact that it is a very minimal change
 * the fix ensures that a lib accessing data unconditionally only gets called if the values are properly initialized

[Test Case]
 * install nis
 * Config in /etc/default/nis:    NISSERVER=master
 * Config in /etc/yp.conf:           ypserver 127.0.0.1
 * Initialize with
     $ sudo /usr/lib/yp/ypinit -m
     $ restart rpcbind
 * Test if your config works
     $ ypcat passwd
     should show something like
     ubuntu:x:1000:1000:Ubuntu:/home/ubuntu:/bin/bash
 * Trigger the bug
     $ yppasswd -p ubuntu
     Changing NIS account information for ubuntu on wily.localdomain.
     Please enter root password:
     Changing NIS password for ubuntu on wily.localdomain.
     Please enter new password:
     Segmentation fault (core dumped)

[Regression Potential]

 * While it is assumed to not regress, if it does it is affected to break yppasswd even more (and while more than a segfault is hard to imagine I mean it might even break for those people that today got around it by some complex and weird workarounds.)
 * The code is only local to the tool yppasswd and it is not part of a lib or so, so the impact - if any - should stay local

[Other Info]
 
 * I really want to encourage the users reporting it being important to them testing it once in proposed to have more than just my tests.
 * I wanted to nominate to be able to keep tracking Wily as Fix Released and Trusty as pending but that doesn't seem to work.
It would be great if the Sponsor with the proper permissions could also set the proper "Affects" status for those two releases

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https://bugs.launchpad.net/bugs/1204530

Title:
  yppasswd results in a segmentation fault when run on clients or server

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