linux-kernel - Re: [PATCH] iio: dac: ad3552r-hs: fix out-of-bound write in ad3552r_hs_write_data

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Message-ID: <aQB8j7Hc3b9vAT5_@smile.fi.intel.com>
Date: Tue, 28 Oct 2025 10:19:27 +0200
From: Andy Shevchenko <andriy.shevchenko@...el.com>
To: Miaoqian Lin <linmq006@...il.com>
Cc: Lars-Peter Clausen <lars@...afoo.de>,
	Michael Hennerich <Michael.Hennerich@...log.com>,
	Jonathan Cameron <jic23@...nel.org>,
	David Lechner <dlechner@...libre.com>,
	Nuno Sá <nuno.sa@...log.com>,
	Andy Shevchenko <andy@...nel.org>,
	Angelo Dureghello <adureghello@...libre.com>,
	linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Subject: Re: [PATCH] iio: dac: ad3552r-hs: fix out-of-bound write in
 ad3552r_hs_write_data_source

On Tue, Oct 28, 2025 at 10:18:05AM +0200, Andy Shevchenko wrote:
> On Mon, Oct 27, 2025 at 11:07:13PM +0800, Miaoqian Lin wrote:

...

> > +	if (count >= sizeof(buf))
> > +		return -ENOSPC;
> 
> But this makes the validation too strict now.
> 
> >  	ret = simple_write_to_buffer(buf, sizeof(buf) - 1, ppos, userbuf,
> >  				     count);
> 
> You definitely failed to read the code that implements the above.
> 
> >  	if (ret < 0)
> >  		return ret;

> > -	buf[count] = '\0';
> > +	buf[ret] = '\0';

Maybe this line is what we might need, but I haven't checked deeper if it's a
problem.

> NAK.
> 
> This patch is an unneeded churn.

-- 
With Best Regards,
Andy Shevchenko