linux-kernel - Re: [RFC PATCH v2] Bluetooth: btusb: Fix memory leak in play

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Date:   Tue, 18 Jul 2017 09:30:15 +0200
From:   Oliver Neukum <oneukum@...e.com>
To:     Marcel Holtmann <marcel@...tmann.org>,
        Jeffy Chen <jeffy.chen@...k-chips.com>
Cc:     linux-kernel@...r.kernel.org, xiyou.wangcong@...il.com,
        briannorris@...omium.org, dianders@...omium.org,
        Johan Hedberg <johan.hedberg@...il.com>,
        "Gustavo F. Padovan" <gustavo@...ovan.org>,
        linux-bluetooth@...r.kernel.org
Subject: Re: [RFC PATCH v2] Bluetooth: btusb: Fix memory leak in
 play_deferred

Am Dienstag, den 18.07.2017, 08:44 +0200 schrieb Marcel Holtmann:
> > diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
> > index 0d533b2..a22a08b 100644
> > --- a/drivers/bluetooth/btusb.c
> > +++ b/drivers/bluetooth/btusb.c
> > @@ -3260,19 +3260,33 @@ static int btusb_suspend(struct usb_interface *intf, pm_message_t message)
> >       return 0;
> > }
> > 
> > +static void btusb_deferred_tx_complete(struct urb *urb)
> > +{
> > +     btusb_tx_complete(urb);
> > +     usb_free_urb(urb);
> > +}
> > +
> > static void play_deferred(struct btusb_data *data)
> > {
> >       struct urb *urb;
> >       int err;
> > 
> >       while ((urb = usb_get_from_anchor(&data->deferred))) {
> > +             /* Add a hook to free urb after completed */
> > +             urb->complete = btusb_deferred_tx_complete;
> > +
> >               err = usb_submit_urb(urb, GFP_ATOMIC);
> > -             if (err < 0)
> > -                     break;
> > +             if (err < 0) {
> > +                     if (err != -EPERM && err != -ENODEV)
> > +                             BT_ERR("%s urb %p submission failed (%d)",
> > +                                    data->hdev->name, urb, -err);
> > +                     kfree(urb->setup_packet);
> > +                     usb_free_urb(urb);
> > +                     continue;
> > +             }
> > 
> >               data->tx_in_flight++;
> >       }
> > -     usb_scuttle_anchored_urbs(&data->deferred);
> > }
> 
> can I get an ack from you on this one?

Hi,

I am afraid not. We cannot silently drop one part of a transmission.
I am afraid that the correct algorithm, if we encounter an error at
that stage, is to abort the operation and report an error.

	Regards
		Oliver