From: Quinn Tran <quinn.tran@cavium.com>
Date: Mon, 4 Dec 2017 14:45:15 -0800
Subject: scsi: qla2xxx: Fix system crash in qlt_plogi_ack_unref
Patch-mainline: v4.16-rc1
Git-commit: 19759033e0d0beed70421ab9258f5ede79e070ae
References: bsc#1077338

Fix system crash due to NULL pointer access.

qlt_plogi_ack_t and fc_port structures were not properly bound before
calling qlt_plogi_ack_unref().

RIP: 0010:qlt_plogi_ack_unref+0xa1/0x150 [qla2xxx]
Call Trace:
qla24xx_create_new_sess+0xb1/0x320 [qla2xxx]
qla2x00_do_work+0x123/0x260 [qla2xxx]
qla2x00_iocb_work_fn+0x30/0x40 [qla2xxx]
process_one_work+0x1f3/0x530
worker_thread+0x4e/0x480
kthread+0x10c/0x140

Fixes: 726b85487067d ("qla2xxx: Add framework for async fabric discovery")
Cc: <stable@vger.kernel.org> # 4.10+
Signed-off-by: Quinn Tran <quinn.tran@cavium.com>
Signed-off-by: Giridhar Malavali <giridhar.malavali@cavium.com>
Signed-off-by: Himanshu Madhani <himanshu.madhani@cavium.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Acked-by: Johannes Thumshirn <jthumshirn@suse.de>
---
 drivers/scsi/qla2xxx/qla_os.c |   10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

--- a/drivers/scsi/qla2xxx/qla_os.c
+++ b/drivers/scsi/qla2xxx/qla_os.c
@@ -4752,11 +4752,11 @@ void qla24xx_create_new_sess(struct scsi
 		} else {
 			list_add_tail(&fcport->list, &vha->vp_fcports);
 
-			if (pla) {
-				qlt_plogi_ack_link(vha, pla, fcport,
-				    QLT_PLOGI_LINK_SAME_WWN);
-				pla->ref_count--;
-			}
+		}
+		if (pla) {
+			qlt_plogi_ack_link(vha, pla, fcport,
+			    QLT_PLOGI_LINK_SAME_WWN);
+			pla->ref_count--;
 		}
 	}
 	spin_unlock_irqrestore(&vha->hw->tgt.sess_lock, flags);