linux-kernel - Re: [patch 0/3] Re: tty contention resulting from tty_open_by

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Date:   Tue, 18 Jul 2017 20:22:59 +0100
From:   Okash Khawaja <okash.khawaja@...il.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>
Cc:     Alan Cox <gnomes@...rguk.ukuu.org.uk>,
        "devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
        Kirk Reiser <kirk@...sers.ca>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "speakup@...ux-speakup.org" <speakup@...ux-speakup.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Jiri Slaby <jslaby@...e.com>,
        Samuel Thibault <samuel.thibault@...-lyon.org>,
        Chris Brannon <chris@...-brannons.com>
Subject: Re: [patch 0/3] Re: tty contention resulting from tty_open_by_device
 export

On Tue, Jul 18, 2017 at 03:26:37PM +0300, Dan Carpenter wrote:
> > +       if (tty) {
> > +               /* drop kref from tty_driver_lookup_tty() */
> > +               tty_kref_put(tty);
> > +               tty = ERR_PTR(-EBUSY);
> > +       } else { /* tty_init_dev returns tty with the tty_lock held */
> > +               tty = tty_init_dev(driver, index);
> > +               tty_port_set_kopened(tty->port, 1);
>                                        ^^^^^^^^^
> 
> tty_init_dev() can fail leading to an error pointer dereference here.

Thanks very much. I will check for error pointer here.

Okash