s3: winbindd: Old NT Domain code sets struct winbind_domain->alt_name to be NULL. Ensure this is safe with modern AD-DCs.
There are places in the code where we're not checking that alt_name is NULL
and then calling into the DC lookup code with a NULL name request. This can
happen in offline mode.
Fixes bug #10717 - Winbind crash on losing VPN connection
https://bugzilla.samba.org/show_bug.cgi?id=10717
Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Michael Adam <obnox@samba.org>
Autobuild-User(master): Michael Adam <obnox@samba.org>
Autobuild-Date(master): Mon Sep 15 23:29:00 CEST 2014 on sn-devel-104
(cherry picked from commit
92da0b243c18546275c4736507188eba425a0732)