linux-kernel - [PATCH 4.14 14/41] scsi: ibmvscsis: Ensure partition name is properly NUL terminated

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Date:   Thu, 18 Oct 2018 19:54:29 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Kees Cook <keescook@...omium.org>,
        Laura Abbott <labbott@...hat.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.14 14/41] scsi: ibmvscsis: Ensure partition name is properly NUL terminated

4.14-stable review patch.  If anyone has any objections, please let me know.

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

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c
+++ b/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c
@@ -3468,7 +3468,7 @@ static int ibmvscsis_probe(struct vio_de
 	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;