scsi: lpfc: Fix use-after-free rport memory access in lpfc_register_remote_port()

Due to a target port D_ID swap, it is possible for the
lpfc_register_remote_port() routine to touch post mortem fc_rport memory
when trying to access fc_rport->dd_data.

The D_ID swap causes a simultaneous call to lpfc_unregister_remote_port(),
where fc_remote_port_delete() reclaims fc_rport memory.

Remove the fc_rport->dd_data->pnode NULL assignment because the following
line reassigns ndlp->rport with an fc_rport object from
fc_remote_port_add() anyways.  The pnode nullification is superfluous.
Signed-off-by: Justin Tee <justin.tee@broadcom.com>
Link: https://lore.kernel.org/r/20230523183206.7728-2-justintee8345@gmail.comAcked-by: Martin Wilck <mwilck@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/lpfc/lpfc_hbadisc.c

@@ -4498,14 +4498,6 @@ lpfc_register_remote_port(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp)
 	if (vport->load_flag & FC_UNLOADING)
 		return;
 
-	/*
-	 * Disassociate any older association between this ndlp and rport
-	 */
-	if (ndlp->rport) {
-		rdata = ndlp->rport->dd_data;
-		rdata->pnode = NULL;
-	}
-
 	ndlp->rport = rport = fc_remote_port_add(shost, 0, &rport_ids);
 	if (!rport) {
 		dev_printk(KERN_WARNING, &phba->pcidev->dev,