linux-kernel - Re: [PATCH v2 1/4] scsi: sd: reject invalid pr_read_keys() num

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Message-ID: <20251201150909.GB866564@fedora>
Date: Mon, 1 Dec 2025 10:09:09 -0500
From: Stefan Hajnoczi <stefanha@...hat.com>
To: Christoph Hellwig <hch@....de>
Cc: linux-block@...r.kernel.org, Keith Busch <kbusch@...nel.org>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	linux-kernel@...r.kernel.org,
	"James E.J. Bottomley" <James.Bottomley@...senpartnership.com>,
	Mike Christie <michael.christie@...cle.com>,
	linux-nvme@...ts.infradead.org, Jens Axboe <axboe@...nel.dk>,
	linux-scsi@...r.kernel.org, Sagi Grimberg <sagi@...mberg.me>
Subject: Re: [PATCH v2 1/4] scsi: sd: reject invalid pr_read_keys() num_keys
 values

On Mon, Dec 01, 2025 at 07:34:13AM +0100, Christoph Hellwig wrote:
> On Thu, Nov 27, 2025 at 10:54:21AM -0500, Stefan Hajnoczi wrote:
> > +	/*
> > +	 * Each reservation key takes 8 bytes and there is an 8-byte header
> > +	 * before the reservation key list. The total size must fit into the
> > +	 * 16-bit ALLOCATION LENGTH field.
> > +	 */
> > +	if (num_keys > (USHRT_MAX / 8) - 1)
> > +		return -EINVAL;
> > +
> > +	data_len = num_keys * 8 + 8;
> 
> Having the same arithmerics express here in two different ways is a bit
> odd.
> 
> I'd expected this to be something like:
> 
> 	if (check_mul_overflow(num_keys, 8, &data_len) || data_len > USHRT_MAX)
> 		return -EINVAL;

Thanks, will fix.

Stefan

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