Re: [PATCH v2] iio: pressure: dlhl60d: Initialize empty DLH bytes

[Kees Cook <keescook@chromium.org>]

On Fri, Feb 23, 2024 at 07:47:36PM +0200, Andy Shevchenko wrote:
> On Fri, Feb 23, 2024 at 09:29:39AM -0800, Kees Cook wrote:
> > 3 bytes were being read but 4 were being written. Explicitly initialize
> > the unused bytes to 0 and refactor the loop to use direct array
> > indexing, which appears to silence a Clang false positive warning[1].
> 
> ...
> 
> >  	for_each_set_bit(chn, indio_dev->active_scan_mask,
> > -		indio_dev->masklength) {
> > -		memcpy(tmp_buf + i,
> > +			 indio_dev->masklength) {
> > +		memcpy(&tmp_buf[i++],
> >  			&st->rx_buf[1] + chn * DLH_NUM_DATA_BYTES,
> >  			DLH_NUM_DATA_BYTES);
> > -		i++;
> >  	}
> 
> Not that I'm against the changes, but they (in accordance with the commit
> message) are irrelevant to this fix. I prefer fixes to be more focused on
> the real issues.

Jonathan, let me know if you'd prefer I split this patch...

-- 
Kees Cook