linux-kernel - [PATCH 3.16 39/61] scsi: sg: fix SG_DXFER_FROM

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Date:   Tue, 09 Jun 2020 19:04:30 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Hannes Reinecke" <hare@...e.com>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        "Douglas Gilbert" <dgilbert@...erlog.com>,
        "Cristian Crinteanu" <crinteanu.cristian@...il.com>,
        "Chris Clayton" <chris2553@...glemail.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        "Johannes Thumshirn" <jthumshirn@...e.de>
Subject: [PATCH 3.16 39/61] scsi: sg: fix SG_DXFER_FROM_DEV transfers

3.16.85-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Johannes Thumshirn <jthumshirn@...e.de>

commit 68c59fcea1f2c6a54c62aa896cc623c1b5bc9b47 upstream.

SG_DXFER_FROM_DEV transfers do not necessarily have a dxferp as we set
it to NULL for the old sg_io read/write interface, but must have a
length bigger than 0. This fixes a regression introduced by commit
28676d869bbb ("scsi: sg: check for valid direction before starting the
request")

Signed-off-by: Johannes Thumshirn <jthumshirn@...e.de>
Fixes: 28676d869bbb ("scsi: sg: check for valid direction before starting the request")
Reported-by: Chris Clayton <chris2553@...glemail.com>
Tested-by: Chris Clayton <chris2553@...glemail.com>
Cc: Douglas Gilbert <dgilbert@...erlog.com>
Reviewed-by: Hannes Reinecke <hare@...e.com>
Tested-by: Chris Clayton <chris2553@...glemail.com>
Acked-by: Douglas Gilbert <dgilbert@...erlog.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Cc: Cristian Crinteanu <crinteanu.cristian@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/scsi/sg.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -795,8 +795,11 @@ static bool sg_is_valid_dxfer(sg_io_hdr_
 		if (hp->dxferp || hp->dxfer_len > 0)
 			return false;
 		return true;
-	case SG_DXFER_TO_DEV:
 	case SG_DXFER_FROM_DEV:
+		if (hp->dxfer_len < 0)
+			return false;
+		return true;
+	case SG_DXFER_TO_DEV:
 	case SG_DXFER_TO_FROM_DEV:
 		if (!hp->dxferp || hp->dxfer_len == 0)
 			return false;