linux-kernel - Re: [PATCH v4 1/3] usb: typec: ucsi: Limit read size on v1.2

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Message-ID: <ZcY2kVlUn7SJ5pW8@smile.fi.intel.com>
Date: Fri, 9 Feb 2024 16:28:33 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Abhishek Pandit-Subedi <abhishekpandit@...omium.org>
Cc: Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	linux-usb@...r.kernel.org, jthies@...gle.com, pmalani@...omium.org,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
	Fabrice Gasnier <fabrice.gasnier@...s.st.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Hans de Goede <hdegoede@...hat.com>,
	Rajaram Regupathy <rajaram.regupathy@...el.com>,
	Saranya Gopal <saranya.gopal@...el.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 1/3] usb: typec: ucsi: Limit read size on v1.2

On Thu, Feb 08, 2024 at 10:02:38PM -0800, Abhishek Pandit-Subedi wrote:
> Between UCSI 1.2 and UCSI 2.0, the size of the MESSAGE_IN region was
> increased from 16 to 256. In order to avoid overflowing reads for older
> systems, add a mechanism to use the read UCSI version to truncate read
> sizes on UCSI v1.2.

..

> +	if (ucsi->version <= UCSI_VERSION_1_2)
> +		buf_size = min_t(size_t, 16, buf_size);

Please, avoid using min_t(). Here the clamp() can be used.
Shouldn't magic number be defined?

-- 
With Best Regards,
Andy Shevchenko