https://fedorahosted.org/389/ticket/47659https://fedorahosted.org/389/attachment/ticket/47659/0001-Ticket-47659-ldbm…
Bug description: A suffix mapping tree could exist without the
corresponding
backend. The existing code did not properly check the backend returned
from
slapi_mapping_tree_find_backend_for_sdn. When NULL backend is returned,
it
triggers the NULL pointer dereference.
Fix description: This patch added a NULL backend check to
usn_get_last_usn,
and moved a logging to the if clause where the backend is not NULL.