linux-kernel - [PATCH 5.17 265/298] scsi: sd: Fix interpretation of VPD B9h length

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Message-Id: <20220613094933.110413856@linuxfoundation.org>
Date:   Mon, 13 Jun 2022 12:12:39 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Michael English <michael.english@...gate.com>,
        Muhammad Ahmad <muhammad.ahmad@...gate.com>,
        Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
        Hannes Reinecke <hare@...e.de>,
        Tyler Erickson <tyler.erickson@...gate.com>,
        Christoph Hellwig <hch@....de>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Subject: [PATCH 5.17 265/298] scsi: sd: Fix interpretation of VPD B9h length

From: Tyler Erickson <tyler.erickson@...gate.com>

commit f92de9d110429e39929a49240d823251c2fe903e upstream.

Fixing the interpretation of the length of the B9h VPD page (Concurrent
Positioning Ranges). Adding 4 is necessary as the first 4 bytes of the page
is the header with page number and length information.  Adding 3 was likely
a misinterpretation of the SBC-5 specification which sets all offsets
starting at zero.

This fixes the error in dmesg:

[ 9.014456] sd 1:0:0:0: [sda] Invalid Concurrent Positioning Ranges VPD page

Link: https://lore.kernel.org/r/20220602225113.10218-4-tyler.erickson@seagate.com
Fixes: e815d36548f0 ("scsi: sd: add concurrent positioning ranges support")
Cc: stable@...r.kernel.org
Tested-by: Michael English <michael.english@...gate.com>
Reviewed-by: Muhammad Ahmad <muhammad.ahmad@...gate.com>
Reviewed-by: Damien Le Moal <damien.lemoal@...nsource.wdc.com>
Reviewed-by: Hannes Reinecke <hare@...e.de>
Signed-off-by: Tyler Erickson <tyler.erickson@...gate.com>
Signed-off-by: Christoph Hellwig <hch@....de>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/scsi/sd.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -3171,7 +3171,7 @@ static void sd_read_cpr(struct scsi_disk
 		goto out;
 
 	/* We must have at least a 64B header and one 32B range descriptor */
-	vpd_len = get_unaligned_be16(&buffer[2]) + 3;
+	vpd_len = get_unaligned_be16(&buffer[2]) + 4;
 	if (vpd_len > buf_len || vpd_len < 64 + 32 || (vpd_len & 31)) {
 		sd_printk(KERN_ERR, sdkp,
 			  "Invalid Concurrent Positioning Ranges VPD page\n");