From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Tue, 14 Dec 2021 07:05:27 +0000 (+0300)
Subject: scsi: lpfc: Terminate string in lpfc_debugfs_nvmeio_trc_write()
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=a68d72d899a2051e5a05f78aed9604fbc1f3ff34;p=linux.git

scsi: lpfc: Terminate string in lpfc_debugfs_nvmeio_trc_write()

[ Upstream commit 9020be114a47bf7ff33e179b3bb0016b91a098e6 ]

The "mybuf" string comes from the user, so we need to ensure that it is NUL
terminated.

Link: https://lore.kernel.org/r/20211214070527.GA27934@kili
Fixes: bd2cdd5e400f ("scsi: lpfc: NVME Initiator: Add debugfs support")
Reviewed-by: James Smart <jsmart2021@gmail.com>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/drivers/scsi/lpfc/lpfc_debugfs.c b/drivers/scsi/lpfc/lpfc_debugfs.c
index bd6d459afce54..08b2e85dcd7d8 100644
--- a/drivers/scsi/lpfc/lpfc_debugfs.c
+++ b/drivers/scsi/lpfc/lpfc_debugfs.c
@@ -2954,8 +2954,8 @@ lpfc_debugfs_nvmeio_trc_write(struct file *file, const char __user *buf,
 	char mybuf[64];
 	char *pbuf;
 
-	if (nbytes > 64)
-		nbytes = 64;
+	if (nbytes > 63)
+		nbytes = 63;
 
 	memset(mybuf, 0, sizeof(mybuf));