linux-kernel - [PATCH] scsi: fcoe: sanity check string size for store_ctrl

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Message-Id: <20170322140137.28485-1-colin.king@canonical.com>
Date:   Wed, 22 Mar 2017 14:01:37 +0000
From:   Colin King <colin.king@...onical.com>
To:     Johannes Thumshirn <jth@...nel.org>,
        "James E . J . Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        fcoe-devel@...n-fcoe.org, linux-scsi@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] scsi: fcoe: sanity check string size for store_ctrl_mode option

From: Colin Ian King <colin.king@...onical.com>

Reading and writing to mode[count - 1] implies the count should not
be less than 1 so add a sanity check for this.

Detected with CoverityScan, CID#1357345 ("Overflowed array index write")

Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/scsi/fcoe/fcoe_sysfs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/fcoe/fcoe_sysfs.c b/drivers/scsi/fcoe/fcoe_sysfs.c
index 9cf3d56296ab..e298240c728c 100644
--- a/drivers/scsi/fcoe/fcoe_sysfs.c
+++ b/drivers/scsi/fcoe/fcoe_sysfs.c
@@ -288,7 +288,7 @@ static ssize_t store_ctlr_mode(struct device *dev,
 	struct fcoe_ctlr_device *ctlr = dev_to_ctlr(dev);
 	char mode[FCOE_MAX_MODENAME_LEN + 1];
 
-	if (count > FCOE_MAX_MODENAME_LEN)
+	if (count < 1 || count > FCOE_MAX_MODENAME_LEN)
 		return -EINVAL;
 
 	strncpy(mode, buf, count);
-- 
2.11.0