linux-kernel - Re: [PATCH] USB: xhci: dbc: fix tty registration race

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Message-ID: <87c08115-06e0-6734-887a-7ae4e97fe5ab@linux.intel.com>
Date:   Thu, 30 Sep 2021 12:24:10 +0300
From:   Mathias Nyman <mathias.nyman@...ux.intel.com>
To:     Johan Hovold <johan@...nel.org>,
        Mathias Nyman <mathias.nyman@...el.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, Lu Baolu <baolu.lu@...ux.intel.com>
Subject: Re: [PATCH] USB: xhci: dbc: fix tty registration race

On 28.9.2021 15.04, Johan Hovold wrote:
> Make sure to allocate resources before registering the tty device to
> avoid having a racing open() and write() fail to enable rx or
> dereference a NULL pointer when accessing the uninitialised fifo.
> 
> Fixes: dfba2174dc42 ("usb: xhci: Add DbC support in xHCI driver")
> Cc: stable@...r.kernel.org      # 4.16
> Cc: Lu Baolu <baolu.lu@...ux.intel.com>
> Signed-off-by: Johan Hovold <johan@...nel.org>

Thanks, adding to queue

-Mathias