scsi: lpfc: Correct null ndlp reference on routine exit

smatch correctly called out a logic error with accessing a pointer after
checking it for null:

 drivers/scsi/lpfc/lpfc_els.c:2043 lpfc_cmpl_els_plogi()
 error: we previously assumed 'ndlp' could be null (see line 1942)

Adjust the exit point to avoid the trace printf ndlp reference. A trace
entry was already generated when the ndlp was checked for null.

Link: https://lore.kernel.org/r/20201130181226.16675-1-james.smart@broadcom.com
Fixes: 4430f7fd09ec ("scsi: lpfc: Rework locations of ndlp reference taking")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: James Smart <james.smart@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/lpfc/lpfc_els.c b/drivers/scsi/lpfc/lpfc_els.c
index fd5c581cd67a6a3c81aef9801a2b87780f35322a..96c087b8b4744f5338de6d5af44a4fb3c688cf01 100644 (file)
--- a/drivers/scsi/lpfc/lpfc_els.c
+++ b/drivers/scsi/lpfc/lpfc_els.c
@@ -1946,7 +1946,7 @@ lpfc_cmpl_els_plogi(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
                                 irsp->un.elsreq64.remoteID,
                                 irsp->ulpStatus, irsp->un.ulpWord[4],
                                 irsp->ulpIoTag);
-               goto out;
+               goto out_freeiocb;
        }
 
        /* Since ndlp can be freed in the disc state machine, note if this node
@@ -2042,6 +2042,7 @@ out:
                              "PLOGI Cmpl PUT:     did:x%x refcnt %d",
                              ndlp->nlp_DID, kref_read(&ndlp->kref), 0);
 
+out_freeiocb:
        /* Release the reference on the original I/O request. */
        free_ndlp = (struct lpfc_nodelist *)cmdiocb->context1;