linux-kernel - Re: [PATCH] usb: raw-gadget: do not limit transfer length

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Message-ID: <CA+fCnZdHJtHgZuD9tiDGD8svXTEdP=GK8HSo71y_UfKgZcaUxg@mail.gmail.com>
Date: Tue, 21 Oct 2025 16:19:13 +0200
From: Andrey Konovalov <andreyknvl@...il.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Alan Stern <stern@...land.harvard.edu>, linux-usb@...r.kernel.org, 
	linux-kernel@...r.kernel.org, stable@...r.kernel.org, 
	andrey.konovalov@...ux.dev
Subject: Re: [PATCH] usb: raw-gadget: do not limit transfer length

On Tue, Oct 21, 2025 at 4:18 PM Andrey Konovalov <andreyknvl@...il.com> wrote:
>
> On Thu, Sep 4, 2025 at 10:08 PM <andrey.konovalov@...ux.dev> wrote:
> >
> > From: Andrey Konovalov <andreyknvl@...il.com>
> >
> > Drop the check on the maximum transfer length in Raw Gadget for both
> > control and non-control transfers.
> >
> > Limiting the transfer length causes a problem with emulating USB devices
> > whose full configuration descriptor exceeds PAGE_SIZE in length.
> >
> > Overall, there does not appear to be any reason to enforce any kind of
> > transfer length limit on the Raw Gadget side for either control or
> > non-control transfers, so let's just drop the related check.
> >
> > Cc: stable@...r.kernel.org
> > Fixes: f2c2e717642c ("usb: gadget: add raw-gadget interface")
> > Signed-off-by: Andrey Konovalov <andreyknvl@...il.com>
> > ---
> >  drivers/usb/gadget/legacy/raw_gadget.c | 2 --
> >  1 file changed, 2 deletions(-)
> >
> > diff --git a/drivers/usb/gadget/legacy/raw_gadget.c b/drivers/usb/gadget/legacy/raw_gadget.c
> > index 20165e1582d9..b71680c58de6 100644
> > --- a/drivers/usb/gadget/legacy/raw_gadget.c
> > +++ b/drivers/usb/gadget/legacy/raw_gadget.c
> > @@ -667,8 +667,6 @@ static void *raw_alloc_io_data(struct usb_raw_ep_io *io, void __user *ptr,
> >                 return ERR_PTR(-EINVAL);
> >         if (!usb_raw_io_flags_valid(io->flags))
> >                 return ERR_PTR(-EINVAL);
> > -       if (io->length > PAGE_SIZE)
> > -               return ERR_PTR(-EINVAL);
> >         if (get_from_user)
> >                 data = memdup_user(ptr + sizeof(*io), io->length);
> >         else {
> > --
> > 2.43.0
> >
>
> Hi Greg,
>
> Could you pick up this patch?
>
> Thank you!

(Greg to To:)