[LU-6875] thandle_get_sub_by_dt dereferences ERR_PTR pointer on error

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.8.0
• Affects Version/s: Lustre 2.8.0
• Severity: 3
• Assignee: Di Wang
• Reporter: Oleg Drokin

Description

thandle_get_sub_by_dt function dereferences PTR_ERR pointer:

                st = create_sub_thandle_with_thandle(top_th,
                                top_th->tt_master_sub_thandle);
                if (IS_ERR(st))
                        GOTO(stop_trans, rc = PTR_ERR(st));
....
stop_trans:
        if (rc < 0) {
                if (st != NULL)
                        OBD_FREE_PTR(st);