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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Quinn Tran <quinn.tran@cavium.com>,
        Giridhar Malavali <giridhar.malavali@cavium.com>,
        Himanshu Madhani <himanshu.madhani@cavium.com>,
        Hannes Reinecke <hare@suse.com>,
        "Martin K. Petersen" <martin.petersen@oracle.com>
Subject: [PATCH 4.15 142/146] scsi: qla2xxx: Fix system crash in qlt_plogi_ack_unref
Date:   Tue, 13 Mar 2018 16:25:09 +0100
Message-Id: <20180313152331.026527973@linuxfoundation.org>
In-Reply-To: <20180313152320.439085687@linuxfoundation.org>
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4.15-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Quinn Tran <quinn.tran@cavium.com>

commit 19759033e0d0beed70421ab9258f5ede79e070ae upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 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
@@ -4750,11 +4750,11 @@ 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);