From: David Herrmann <dh.herrmann@gmail.com>
Date: Sat, 5 Sep 2015 10:56:04 +0000 (+0200)
Subject: login: fix NULL-deref on wall_message
X-Git-Tag: v226.4~1^2~82
X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=commitdiff_plain;h=ba5bb9837fda291f45cffa97fe8347e045a93694;hp=ba5bb9837fda291f45cffa97fe8347e045a93694;p=elogind.git

login: fix NULL-deref on wall_message

We treat an empty wall-message equal to a NULL wall-message since:

        commit 5744f59a3ee883ef3a78214bd5236157acdc35ba
        Author: Lennart Poettering <lennart@poettering.net>
        Date:   Fri Sep 4 10:34:47 2015 +0200

            logind: treat an empty wall message like a NULL one

Fix the shutdown scheduler to not deref a NULL pointer, but properly
check for an empty wall-message.

Fixes: #1120
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