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Date: Fri, 23 Feb 2024 19:47:36 +0200
From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: Kees Cook <keescook@chromium.org>
Cc: Jonathan Cameron <jic23@kernel.org>,
	Lars-Peter Clausen <lars@metafoo.de>,
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	linux-iio@vger.kernel.org, Nathan Chancellor <nathan@kernel.org>,
	Nick Desaulniers <ndesaulniers@google.com>,
	Bill Wendling <morbo@google.com>,
	Justin Stitt <justinstitt@google.com>, llvm@lists.linux.dev,
	Tomislav Denis <tomislav.denis@avl.com>,
	linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org
Subject: Re: [PATCH v2] iio: pressure: dlhl60d: Initialize empty DLH bytes
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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.

-- 
With Best Regards,
Andy Shevchenko