linux-kernel - Re: [PATCH v3] cxl: Check for invalid addresses returned from translation functions on errors

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Message-ID: <20260108161348.00003911@huawei.com>
Date: Thu, 8 Jan 2026 16:13:48 +0000
From: Jonathan Cameron <jonathan.cameron@...wei.com>
To: Robert Richter <rrichter@....com>
CC: Davidlohr Bueso <dave@...olabs.net>, Dave Jiang <dave.jiang@...el.com>,
	Alison Schofield <alison.schofield@...el.com>, Vishal Verma
	<vishal.l.verma@...el.com>, Ira Weiny <ira.weiny@...el.com>, Dan Williams
	<dan.j.williams@...el.com>, <linux-cxl@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] cxl: Check for invalid addresses returned from
 translation functions on errors

On Wed, 7 Jan 2026 13:05:43 +0100
Robert Richter <rrichter@....com> wrote:

> Translation functions may return an invalid address in case of errors.
> If the address is not checked the further use of the invalid value
> will cause an address corruption.
> 
> Consistently check for a valid address returned by translation
> functions. Use RESOURCE_SIZE_MAX to indicate an invalid address for
> type resource_size_t. Depending on the type either RESOURCE_SIZE_MAX
> or ULLONG_MAX is used to indicate an address error.
> 
> Reviewed-by: Dave Jiang <dave.jiang@...el.com>
> Signed-off-by: Robert Richter <rrichter@....com>
Nice patch.
Reviewed-by: Jonathan Cameron <jonathan.cameron@...wei.com>