linux-kernel - [PATCHv3 1/2] scsi: ibmvscsis: Fix a stringop-overflow warning

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Date:   Tue, 11 Sep 2018 12:22:25 -0700
From:   Laura Abbott <labbott@...hat.com>
To:     "Bryant G. Ly" <bryantly@...ux.vnet.ibm.com>,
        Michael Cyr <mikecyr@...ux.vnet.ibm.com>,
        Kees Cook <keescook@...omium.org>
Cc:     Laura Abbott <labbott@...hat.com>,
        "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        linux-scsi@...r.kernel.org, target-devel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCHv3 1/2] scsi: ibmvscsis: Fix a stringop-overflow warning


There's currently a warning about string overflow with strncat:

drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c: In function 'ibmvscsis_probe':
drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c:3479:2: error: 'strncat' specified
bound 64 equals destination size [-Werror=stringop-overflow=]
  strncat(vscsi->eye, vdev->name, MAX_EYE);
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Switch to a single snprintf instead of a strcpy + strcat to handle this
cleanly.

Signed-off-by: Laura Abbott <labbott@...hat.com>
---
v3: Make sure there is an extra space in the partition name
---
 drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c b/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c
index fac377320158..b3a029ad07cd 100644
--- a/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c
+++ b/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c
@@ -3474,8 +3474,7 @@ static int ibmvscsis_probe(struct vio_dev *vdev,
 		vscsi->dds.window[LOCAL].liobn,
 		vscsi->dds.window[REMOTE].liobn);
 
-	strcpy(vscsi->eye, "VSCSI ");
-	strncat(vscsi->eye, vdev->name, MAX_EYE);
+	snprintf(vscsi->eye, sizeof(vscsi->eye), "VSCSI %s", vdev->name);
 
 	vscsi->dds.unit_id = vdev->unit_address;
 	strncpy(vscsi->dds.partition_name, partition_name,
-- 
2.17.1