[389-devel] Please review: [389 Project] #47659: ldbm_usn_init: Valgrind reports Invalid read / SIGSEGV

[Noriko Hosoi]

https://fedorahosted.org/389/ticket/47659

https://fedorahosted.org/389/attachment/ticket/47659/0001-Ticket-47659-ldbm_usn_init-Valgrind-reports-Invalid-.patch

  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.