linux-kernel - [PATCH 5.10 442/663] octeontx2-af: Fix an off by one in rvu_dbg_qsize

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Message-Id: <20210301161203.768226053@linuxfoundation.org>
Date:   Mon,  1 Mar 2021 17:11:30 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.10 442/663] octeontx2-af: Fix an off by one in rvu_dbg_qsize_write()

From: Dan Carpenter <dan.carpenter@...cle.com>

[ Upstream commit 3a2eb515d1367c0f667b76089a6e727279c688b8 ]

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>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 77adad4adb1bc..809f50ab0432e 100644
--- a/drivers/net/ethernet/marvell/octeontx2/af/rvu_debugfs.c
+++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu_debugfs.c
@@ -332,7 +332,7 @@ 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;
 
-- 
2.27.0