linux-kernel - Re: [PATCH] USB: serial: opticon: fix control-message timeouts

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Date:   Tue, 14 Jan 2020 12:07:59 +0100
From:   Johan Hovold <johan@...nel.org>
To:     Greg KH <greg@...ah.com>
Cc:     Johan Hovold <johan@...nel.org>, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, stable <stable@...r.kernel.org>,
        Martin Jansen <martin.jansen@...icon.com>
Subject: Re: [PATCH] USB: serial: opticon: fix control-message timeouts

On Mon, Jan 13, 2020 at 07:25:46PM +0100, Greg Kroah-Hartman wrote:
> On Mon, Jan 13, 2020 at 06:22:13PM +0100, Johan Hovold wrote:
> > The driver was issuing synchronous uninterruptible control requests
> > without using a timeout. This could lead to the driver hanging
> > on open() or tiocmset() due to a malfunctioning (or malicious) device
> > until the device is physically disconnected.
> > 
> > The USB upper limit of five seconds per request should be more than
> > enough.
> > 
> > Fixes: 309a057932ab ("USB: opticon: add rts and cts support")
> > Cc: stable <stable@...r.kernel.org>     # 2.6.39
> > Cc: Martin Jansen <martin.jansen@...icon.com>
> > Signed-off-by: Johan Hovold <johan@...nel.org>
> 
> Reviewed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

Thanks for reviewing these. This one; now applied.

Johan