linux-kernel - Re: [PATCH USB 1/2] usb: raw-gadget: fix return value of ep read ioctls

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Date:   Fri, 24 Apr 2020 15:16:35 +0200
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        USB list <linux-usb@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Felipe Balbi <balbi@...nel.org>,
        Jonathan Corbet <corbet@....net>,
        Alan Stern <stern@...land.harvard.edu>
Subject: Re: [PATCH USB 1/2] usb: raw-gadget: fix return value of ep read ioctls

On Fri, Apr 24, 2020 at 10:43 AM Dan Carpenter <dan.carpenter@...cle.com> wrote:
>
> On Fri, Apr 24, 2020 at 03:09:58AM +0200, Andrey Konovalov wrote:
> > They must return the number of bytes transferred during the data stage.
> >
> > Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
>
> This was my mistake.  Please add a Fixes tag.
>
> Fixes: 068fbff4f860 ("usb: raw-gadget: Fix copy_to/from_user() checks")
>
> I should have seen that bug...  I thought I was being careful and I
> even singled out that part of the commit and mentioned it in the
> commit message but I messed up.  Sorry.

No worries, the bug was actually present before your change, but in a
slightly different form. So FWIW we can also add:

Fixes: f2c2e717642c ("usb: gadget: add raw-gadget interface")

However raw-gadget is not present in any released kernel yet, so need
of backporting AFAIU.