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Inside the nested event loop in ctdb_ctrl_getnodemap(), various asynchronous handlers may dereference rec->nodemap, which will be NULL. One example is lost_reclock_handler(), which causes rec->nodemap to be unconditionally dereferenced in list_of_nodes() via this call chain: list_of_nodes() list_of_active_nodes() set_recovery_mode() force_election() lost_reclock_handler() Instead of attempting to trace all of the cases, just avoid leaving rec->nodemap set to NULL. Attempting to use an old value is generally harmless, especially since it will be the same as the new value in most cases. BUG: https://bugzilla.samba.org/show_bug.cgi?id=14324 Reported-by: Volker Lendecke <vl@samba.org> Signed-off-by: Martin Schwenke <martin@meltin.net> Reviewed-by: Amitay Isaacs <amitay@gmail.com> Autobuild-User(master): Martin Schwenke <martins@samba.org> Autobuild-Date(master): Tue Mar 24 01:22:45 UTC 2020 on sn-devel-184
This is the release version of CTDB, a clustered implementation of TDB database used by Samba and other projects to store temporary data. This software is freely distributable under the GNU public license, a copy of which you should have received with this software (in a file called COPYING). For documentation on CTDB, please visit CTDB website http://ctdb.samba.org.