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Description of problem:

seems this should be a backport of
 
https://bugzilla.redhat.com/show_bug.cgi?id=1366266

to RHEL6:
=========================
        if (preq->pd->name_is_upn) {
            ret = sysdb_search_user_by_upn(preq, dom, name, user_attrs, &msg);

            /* Since sysdb_search_user_by_upn() searches the whole cache we
             * have to set the domain so that it matches the result. */
            sysdb_name = ldb_msg_find_attr_as_string(msg, SYSDB_NAME, NULL);
            if (sysdb_name == NULL) {
                DEBUG(SSSDBG_CRIT_FAILURE, "Cached entry has no name.\n");
                return EINVAL;
            }

================================

A customer is hitting this bug. where the sysdb_search_user_by_upn ret is not checked.

Version-Release number of selected component (if applicable): sssd-1.13.3-60.el6

Hello Namita,

can you please QE ack for this 6.10.z BZ.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2019:0063

*** Bug 1602025 has been marked as a duplicate of this bug. ***