[Bug 222510] security/sudo: Immediate segfault when hostname is not defined

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222510

            Bug ID: 222510
           Summary: security/sudo: Immediate segfault when hostname is not
                    defined
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: garga at FreeBSD.org
          Reporter: ygy at freebsd.org
             Flags: maintainer-feedback?(garga at FreeBSD.org)
          Assignee: garga at FreeBSD.org

I am running 12.0-CURRENT r323729 and sudo 1.8.21p2. Without setting a hostname
(leave hostname="" in /etc/rc.conf), sudo will segfault immediately with no
useful information given. Once set the hostname, sudo will work just fine.

This is probably a similar bug as described in
https://forums.freebsd.org/threads/62311/ and
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222115.

root@:~ # sudo
Segmentation fault

root@:~ # sudo --version
Sudo version 1.8.21p2
Configure options: --sysconfdir=/usr/local/etc --with-ignore-dot
--with-tty-tickets --with-env-editor --with-logincap --with-long-otp-prompt
--with-logfac=authpriv --with-bsm-audit --enable-nls --disable-noargs-shell
--with-pam --prefix=/usr/local --localstatedir=/var --mandir=/usr/local/man
--infodir=/usr/local/info/ --build=amd64-portbld-freebsd12.0
Segmentation fault

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