linux-kernel - Re: [PATCH v15 17/19] media: uvcvideo: Add sanity check to uvc_ioctl_xu_ctrl

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Message-ID: <CANiDSCt_5aArcnhLvAKKfOW4sUBNZtB0QQGkS_-AWmTxh_vKMA@mail.gmail.com>
Date: Mon, 9 Dec 2024 15:15:11 +0100
From: Ricardo Ribalda <ribalda@...omium.org>
To: Hans de Goede <hdegoede@...hat.com>
Cc: Laurent Pinchart <laurent.pinchart@...asonboard.com>, 
	Mauro Carvalho Chehab <mchehab@...nel.org>, Ricardo Ribalda <ribalda@...nel.org>, 
	Sakari Ailus <sakari.ailus@...ux.intel.com>, Hans Verkuil <hverkuil@...all.nl>, 
	Yunke Cao <yunkec@...omium.org>, linux-media@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v15 17/19] media: uvcvideo: Add sanity check to uvc_ioctl_xu_ctrl_map

On Mon, 9 Dec 2024 at 15:12, Hans de Goede <hdegoede@...hat.com> wrote:
>
> Hi,
>
> On 14-Nov-24 8:10 PM, Ricardo Ribalda wrote:
> > Do not process unknown data types.
> >
> > Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
> > ---
> >  drivers/media/usb/uvc/uvc_v4l2.c | 6 ++++++
> >  1 file changed, 6 insertions(+)
> >
> > diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c
> > index 5000c74271e0..4c88dab15554 100644
> > --- a/drivers/media/usb/uvc/uvc_v4l2.c
> > +++ b/drivers/media/usb/uvc/uvc_v4l2.c
> > @@ -106,6 +106,12 @@ static int uvc_ioctl_xu_ctrl_map(struct uvc_video_chain *chain,
> >       struct uvc_control_mapping *map;
> >       int ret;
> >
> > +     if (xmap->data_type > UVC_CTRL_DATA_TYPE_BITMASK) {
> > +             uvc_dbg(chain->dev, CONTROL,
> > +                     "Unsupported UVC data type %u\n", xmap->data_type);
> > +             return -ENOTTY;
>
> This seems like a textbook case for -EINVAL ?

Indeed, :) https://lore.kernel.org/linux-media/8258ce59-cd06-46ba-b275-97eb9ae4d64c@redhat.com/T/#m2d38a4cf184ad3e4ea335e92ea74258d1da267c1

Thanks!

>
> Otherwise patch looks good to me:
>
> Reviewed-by: Hans de Goede <hdegoede@...hat.com>
>
> Regards,
>
> Hans
>
>
>
> > +     }
> > +
> >       map = kzalloc(sizeof(*map), GFP_KERNEL);
> >       if (map == NULL)
> >               return -ENOMEM;
> >
>


--
Ricardo Ribalda