netdev - Re: [PATCH net-next] ptp: ocp: fix sprintf overflow in ptp_ocp

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Message-ID: <20220318074504.GD3293@kadam>
Date:   Fri, 18 Mar 2022 10:45:04 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Jonathan Lemon <jonathan.lemon@...il.com>
Cc:     Richard Cochran <richardcochran@...il.com>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH net-next] ptp: ocp: fix sprintf overflow in
 ptp_ocp_verify()

On Thu, Mar 17, 2022 at 10:04:49AM -0700, Jonathan Lemon wrote:
> On Thu, Mar 17, 2022 at 10:59:57AM +0300, Dan Carpenter wrote:
> > The "chan" value comes from the user via sysfs.  A large like UINT_MAX
> > could overflow the buffer by three bytes.  Make the buffer larger and
> > use snprintf() instead of sprintf().
> > 
> > Fixes: 1aa66a3a135a ("ptp: ocp: Program the signal generators via PTP_CLK_REQ_PEROUT")
> > Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
> 
> This needs to be respun to catch up with the last patch.

Thanks.  It turns out you can't actually trigger this bug.  Still using
snprintf() is better so I will resend.

regards,
dan carpenter