From: Daniel Wagner <dwagner@suse.de>
Date: Fri, 18 Oct 2019 18:21:11 +0200
Subject: scsi: lpfc: Check queue pointer before use
Patch-mainline: v5.4-rc6
Git-commit: 535fb49e730a6fe1e9f11af4ae67ef4228ff4287
References: bsc#1154242

The queue pointer might not be valid. The rest of the code checks the
pointer before accessing it. lpfc_sli4_process_missed_mbox_completions is
the only place where the check is missing.

Fixes: 657add4e5e15 ("scsi: lpfc: Fix poor use of hardware queues if fewer irq vectors")
Cc: James Smart <jsmart2021@gmail.com>
Link: https://lore.kernel.org/r/20191018162111.8798-1-dwagner@suse.de
Signed-off-by: Daniel Wagner <dwagner@suse.de>
Reviewed-by: James Smart <james.smart@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
---
 drivers/scsi/lpfc/lpfc_sli.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/scsi/lpfc/lpfc_sli.c
+++ b/drivers/scsi/lpfc/lpfc_sli.c
@@ -7913,7 +7913,7 @@ lpfc_sli4_process_missed_mbox_completion
 	if (sli4_hba->hdwq) {
 		for (eqidx = 0; eqidx < phba->cfg_irq_chann; eqidx++) {
 			eq = phba->sli4_hba.hba_eq_hdl[eqidx].eq;
-			if (eq->queue_id == sli4_hba->mbx_cq->assoc_qid) {
+			if (eq && eq->queue_id == sli4_hba->mbx_cq->assoc_qid) {
 				fpeq = eq;
 				break;
 			}