linux-kernel - [PATCH AUTOSEL 4.18 20/58] scsi: ibmvscsis: Ensure partition name is properly NUL terminated

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Message-Id: <20181008152523.70705-20-sashal@kernel.org>
Date:   Mon,  8 Oct 2018 11:24:45 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     stable@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Laura Abbott <labbott@...hat.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH AUTOSEL 4.18 20/58] scsi: ibmvscsis: Ensure partition name is properly NUL terminated

From: Laura Abbott <labbott@...hat.com>

[ Upstream commit adad633af7b970bfa5dd1b624a4afc83cac9b235 ]

While reviewing another part of the code, Kees noticed that the strncpy of the
partition name might not always be NUL terminated. Switch to using strscpy
which does this safely.

Reported-by: Kees Cook <keescook@...omium.org>
Signed-off-by: Laura Abbott <labbott@...hat.com>
Reviewed-by: Kees Cook <keescook@...omium.org>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c b/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c
index 95bf381413e8..ada1ebebd325 100644
--- a/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c
+++ b/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c
@@ -3478,7 +3478,7 @@ static int ibmvscsis_probe(struct vio_dev *vdev,
 	snprintf(vscsi->eye, sizeof(vscsi->eye), "VSCSI %s", vdev->name);
 
 	vscsi->dds.unit_id = vdev->unit_address;
-	strncpy(vscsi->dds.partition_name, partition_name,
+	strscpy(vscsi->dds.partition_name, partition_name,
 		sizeof(vscsi->dds.partition_name));
 	vscsi->dds.partition_num = partition_number;
 
-- 
2.17.1