linux-kernel - [PATCH] scsi: fas216: fix sense buffer initialization

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Message-Id: <20180118131650.893849-1-arnd@arndb.de>
Date:   Thu, 18 Jan 2018 14:16:38 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Russell King <linux@...linux.org.uk>,
        "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        linux-arm-kernel@...ts.infradead.org, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] scsi: fas216: fix sense buffer initialization

While testing with the ARM specific memset() macro removed, I ran
into a compiler warning that shows an old bug:

drivers/scsi/arm/fas216.c: In function 'fas216_rq_sns_done':
drivers/scsi/arm/fas216.c:2014:40: error: argument to 'sizeof' in 'memset' call is the same expression as the destination; did you mean to provide an explicit length? [-Werror=sizeof-pointer-memaccess]

It turns out that the definition of the scsi_cmd structure changed back
in linux-2.6.25, so now we clear only four bytes (sizeof(pointer)) instead
of 96 (SCSI_SENSE_BUFFERSIZE). I did not check whether we actually need
to initialize the buffer here, but it's clear that if we do it, we
should use the correct size.

Fixes: de25deb18016 ("[SCSI] use dynamically allocated sense buffer")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/scsi/arm/fas216.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/arm/fas216.c b/drivers/scsi/arm/fas216.c
index f4775ca70bab..27bda2b05de6 100644
--- a/drivers/scsi/arm/fas216.c
+++ b/drivers/scsi/arm/fas216.c
@@ -2011,7 +2011,7 @@ static void fas216_rq_sns_done(FAS216_Info *info, struct scsi_cmnd *SCpnt,
 		 * have valid data in the sense buffer that could
 		 * confuse the higher levels.
 		 */
-		memset(SCpnt->sense_buffer, 0, sizeof(SCpnt->sense_buffer));
+		memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
 //printk("scsi%d.%c: sense buffer: ", info->host->host_no, '0' + SCpnt->device->id);
 //{ int i; for (i = 0; i < 32; i++) printk("%02x ", SCpnt->sense_buffer[i]); printk("\n"); }
 	/*
-- 
2.9.0