linux-kernel - Re: [PATCH] media: usbtv: fix control-message timeouts

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Date:   Mon, 13 Jan 2020 19:26:00 +0100
From:   Greg KH <greg@...ah.com>
To:     Johan Hovold <johan@...nel.org>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, stable <stable@...r.kernel.org>,
        Lubomir Rintel <lkundrak@...sk>
Subject: Re: [PATCH] media: usbtv: fix control-message timeouts

On Mon, Jan 13, 2020 at 06:18:18PM +0100, Johan Hovold wrote:
> The driver was issuing synchronous uninterruptible control requests
> without using a timeout. This could lead to the driver hanging on
> various user requests 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: f3d27f34fdd7 ("[media] usbtv: Add driver for Fushicai USBTV007 video frame grabber")
> Fixes: c53a846c48f2 ("[media] usbtv: add video controls")
> Cc: stable <stable@...r.kernel.org>     # 3.11
> Cc: Lubomir Rintel <lkundrak@...sk>
> Signed-off-by: Johan Hovold <johan@...nel.org>

Reviewed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>