linux-kernel - Re: [PATCH 3/4] USB: serial: add support for multi-interface functions

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <e4d3d21cdfe94068c76ceb4ba38630d76fa9418c.camel@suse.com>
Date:   Wed, 31 Mar 2021 09:08:07 +0200
From:   Oliver Neukum <oneukum@...e.com>
To:     Johan Hovold <johan@...nel.org>
Cc:     Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] USB: serial: add support for multi-interface
 functions

Am Dienstag, den 30.03.2021, 17:22 +0200 schrieb Johan Hovold:
> On Tue, Mar 30, 2021 at 04:44:32PM +0200, Oliver Neukum wrote:
> > Am Dienstag, den 30.03.2021, 16:38 +0200 schrieb Johan Hovold:
> > > @@ -1115,6 +1161,8 @@ static void usb_serial_disconnect(struct usb_interface *interface)
> > >         if (serial->type->disconnect)
> > >                 serial->type->disconnect(serial);
> > >  
> > > +       release_sibling(serial, interface);
> > > +
> > >         /* let the last holder of this object cause it to be cleaned up */
> > >         usb_serial_put(serial);
> > >         dev_info(dev, "device disconnected\n");
> > 
> > Hi,
> > 
> > does this assume you are called for the original interface first?
> 
> No, I handle either interface being unbound first (e.g. see
> release_sibling()).
> 
> > I am afraid that is an assumption you cannot make. In fact, if somebody
> > is doing odd things with sysfs you cannot even assume both will see a
> > disconnect()
> 
> Right, but disconnect() will still be called also for the sibling
> interface as part of release_sibling() above.

OK, sorry I overlooked that.

	Regards
		Oliver