linux-kernel - [PATCH 3.16 32/61] scsi: sg: off by one in sg

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Message-ID: <lsq.1591725832.751468300@decadent.org.uk>
Date:   Tue, 09 Jun 2020 19:04:23 +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>,
        "Douglas Gilbert" <dgilbert@...erlog.com>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        "Dan Carpenter" <dan.carpenter@...cle.com>
Subject: [PATCH 3.16 32/61] scsi: sg: off by one in sg_ioctl()

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

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

From: Dan Carpenter <dan.carpenter@...cle.com>

commit bd46fc406b30d1db1aff8dabaff8d18bb423fdcf upstream.

If "val" is SG_MAX_QUEUE then we are one element beyond the end of the
"rinfo" array so the > should be >=.

Fixes: 109bade9c625 ("scsi: sg: use standard lists for sg_requests")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Acked-by: Douglas Gilbert <dgilbert@...erlog.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/scsi/sg.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -1072,7 +1072,7 @@ sg_ioctl(struct file *filp, unsigned int
 			read_lock_irqsave(&sfp->rq_list_lock, iflags);
 			val = 0;
 			list_for_each_entry(srp, &sfp->rq_list, entry) {
-				if (val > SG_MAX_QUEUE)
+				if (val >= SG_MAX_QUEUE)
 					break;
 				memset(&rinfo[val], 0, SZ_SG_REQ_INFO);
 				rinfo[val].req_state = srp->done + 1;