After an initial successful FLOGI into the switch, if a subsequent FLOGI
fails the driver crashed accessing a node struct. On FLOGI error, the
flogi completion logic triggers the final dereference on the node
structure without checking if it is registered with a backend. The
devloss logic is triggered after node is freed leading to the access
of freed node.

Fix by adjusting the error path to not take the final dereferece if there
is an outstanding transport registration. Let the transport devloss call
remove the final reference.

Co-developed-by: Dick Kennedy <redacted>
Signed-off-by: Dick Kennedy <redacted>
Signed-off-by: James Smart <redacted>
---
 drivers/scsi/lpfc/lpfc_els.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/lpfc/lpfc_els.c b/drivers/scsi/lpfc/lpfc_els.c
index 4687830e06da..780b4c1e98eb 100644
--- a/drivers/scsi/lpfc/lpfc_els.c
+++ b/drivers/scsi/lpfc/lpfc_els.c

@@ -1182,7 +1182,8 @@ lpfc_cmpl_els_flogi(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
 	phba->fcf.fcf_flag &= ~FCF_DISCOVERY;
 	spin_unlock_irq(&phba->hbalock);
 
-	lpfc_nlp_put(ndlp);
+	if (!(ndlp->fc4_xpt_flags & (SCSI_XPT_REGD | NVME_XPT_REGD)))
+		lpfc_nlp_put(ndlp);
 	if (!lpfc_error_lost_link(irsp)) {
 		/* FLOGI failed, so just use loop map to make discovery list */
 		lpfc_disc_list_loopmap(vport);

-- 
2.26.2