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

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Message-ID: <CA+sq2CdeKDq6=jDk=mZeSaOVa9N25WvQU8V-k61bYp6ZyN8q-w@mail.gmail.com>
Date:   Sat, 20 Feb 2021 00:06:01 +0530
From:   Sunil Kovvuri <sunil.kovvuri@...il.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>
Cc:     Sunil Goutham <sgoutham@...vell.com>,
        Christina Jacob <cjacob@...vell.com>,
        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>,
        Linux Netdev List <netdev@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH net] octeontx2-af: Fix an off by one in rvu_dbg_qsize_write()

On Fri, Feb 19, 2021 at 3:31 PM Dan Carpenter <dan.carpenter@...cle.com> wrote:
>
> 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
>

Thanks for the fix.