netdev - [PATCH net] octeontx2-af: Fix an off by one in rvu_dbg_qsize

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Message-ID: <YC+LUJ0YhF1Yutaw@mwanda>
Date:   Fri, 19 Feb 2021 12:56:32 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Sunil Goutham <sgoutham@...vell.com>,
        Christina Jacob <cjacob@...vell.com>
Cc:     Linu Cherian <lcherian@...vell.com>,
        Geetha sowjanya <gakula@...vell.com>,
        Jerin Jacob <jerinj@...vell.com>,
        hariprasad <hkelam@...vell.com>,
        Subbaraya Sundeep <sbhatta@...vell.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Prakash Brahmajyosyula <bprakash@...vell.com>,
        netdev@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH net] octeontx2-af: Fix an off by one in rvu_dbg_qsize_write()

This code does not allocate enough memory for the NUL terminator so it
ends up putting it one character beyond the end of the buffer.

Fixes: 8756828a8148 ("octeontx2-af: Add NPA aura and pool contexts to debugfs")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
---
 drivers/net/ethernet/marvell/octeontx2/af/rvu_debugfs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu_debugfs.c b/drivers/net/ethernet/marvell/octeontx2/af/rvu_debugfs.c
index 48a84c65804c..d5f3ad660588 100644
--- a/drivers/net/ethernet/marvell/octeontx2/af/rvu_debugfs.c
+++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu_debugfs.c
@@ -385,7 +385,7 @@ static ssize_t rvu_dbg_qsize_write(struct file *filp,
 	u16 pcifunc;
 	int ret, lf;
 
-	cmd_buf = memdup_user(buffer, count);
+	cmd_buf = memdup_user(buffer, count + 1);
 	if (IS_ERR(cmd_buf))
 		return -ENOMEM;
 
-- 
2.30.0