linux-kernel - Re: [PATCH v2 17/27] compat_ioctl: ide: floppy: add handler

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Date:   Wed, 18 Dec 2019 18:45:36 +0000
From:   Ben Hutchings <ben.hutchings@...ethink.co.uk>
To:     Arnd Bergmann <arnd@...db.de>, Jens Axboe <axboe@...nel.dk>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Cc:     linux-scsi@...r.kernel.org, linux-block@...r.kernel.org,
        y2038@...ts.linaro.org, linux-kernel@...r.kernel.org,
        Christoph Hellwig <hch@....de>, linux-doc@...r.kernel.org,
        corbet@....net, viro@...iv.linux.org.uk,
        linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH v2 17/27] compat_ioctl: ide: floppy: add handler

On Tue, 2019-12-17 at 23:16 +0100, Arnd Bergmann wrote:
> Rather than relying on fs/compat_ioctl.c, this adds support
> for a compat_ioctl() callback in the ide-floppy driver directly,
> which lets it translate the scsi commands.
[...]

After this, and before "compat_ioctl: move HDIO ioctl handling into
drivers/ide", compat ioctls on an IDE hard drive will result in a null
pointer dereference in ide_gd_compat_ioctl().  Not sure how much that
really matters though.

Ben.

-- 
Ben Hutchings, Software Developer                         Codethink Ltd
https://www.codethink.co.uk/                 Dale House, 35 Dale Street
                                     Manchester, M1 2HF, United Kingdom