linux-kernel - [PATCH 4.19 061/205] scsi: qla2xxx: Fix duplicate switch database entries

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Date:   Mon, 19 Nov 2018 17:26:08 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Quinn Tran <quinn.tran@...ium.com>,
        "Ewan D. Milne" <emilne@...hat.com>,
        Himanshu Madhani <himanshu.madhani@...ium.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Subject: [PATCH 4.19 061/205] scsi: qla2xxx: Fix duplicate switch database entries

4.19-stable review patch.  If anyone has any objections, please let me know.

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

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

commit 732ee9a912cf2d9a50c5f9c4213cdc2f885d6aa6 upstream.

The response data buffer used in switch scan is reused 4 times.  (For example,
for commands GPN_FT, GNN_FT for FCP and FC-NVME) Before driver reuses this
buffer, clear it to prevent duplicate entries in our database.

Fixes: a4239945b8ad1 ("scsi: qla2xxx: Add switch command to simplify fabric discovery"
Cc: <stable@...r.kernel.org>
Signed-off-by: Quinn Tran <quinn.tran@...ium.com>
Reviewed-by: Ewan D. Milne <emilne@...hat.com>
Signed-off-by: Himanshu Madhani <himanshu.madhani@...ium.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/scsi/qla2xxx/qla_gs.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- a/drivers/scsi/qla2xxx/qla_gs.c
+++ b/drivers/scsi/qla2xxx/qla_gs.c
@@ -4447,9 +4447,9 @@ int qla24xx_async_gpnft(scsi_qla_host_t
 	sp->u.iocb_cmd.timeout = qla2x00_async_iocb_timeout;
 	qla2x00_init_timer(sp, qla2x00_get_async_timeout(vha) + 2);

-	rspsz = sizeof(struct ct_sns_gpnft_rsp) +
-		((vha->hw->max_fibre_devices - 1) *
-		    sizeof(struct ct_sns_gpn_ft_data));
+	rspsz = sp->u.iocb_cmd.u.ctarg.rsp_size;
+	memset(sp->u.iocb_cmd.u.ctarg.rsp, 0, sp->u.iocb_cmd.u.ctarg.rsp_size);
+	memset(sp->u.iocb_cmd.u.ctarg.req, 0, sp->u.iocb_cmd.u.ctarg.req_size);

 	ct_sns = (struct ct_sns_pkt *)sp->u.iocb_cmd.u.ctarg.req;
 	/* CT_IU preamble  */