linux-kernel - Re: [PATCH 4.19 14/21] staging: comedi: check validity of wMaxPacketSize of usb endpoints found

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Date:   Sat, 17 Oct 2020 10:12:49 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Pavel Machek <pavel@...x.de>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        syzbot+009f546aa1370056b1c2@...kaller.appspotmail.com,
        Anant Thazhemadam <anant.thazhemadam@...il.com>
Subject: Re: [PATCH 4.19 14/21] staging: comedi: check validity of
 wMaxPacketSize of usb endpoints found

On Fri, Oct 16, 2020 at 03:06:27PM +0200, Pavel Machek wrote:
> Hi!
> 
> > From: Anant Thazhemadam <anant.thazhemadam@...il.com>
> > 
> > commit e1f13c879a7c21bd207dc6242455e8e3a1e88b40 upstream.
> > 
> > While finding usb endpoints in vmk80xx_find_usb_endpoints(), check if
> > wMaxPacketSize = 0 for the endpoints found.
> > 
> > Some devices have isochronous endpoints that have wMaxPacketSize = 0
> > (as required by the USB-2 spec).
> > However, since this doesn't apply here, wMaxPacketSize = 0 can be
> > considered to be invalid.
> > 
> > Reported-by: syzbot+009f546aa1370056b1c2@...kaller.appspotmail.com
> > Tested-by: syzbot+009f546aa1370056b1c2@...kaller.appspotmail.com
> > Signed-off-by: Anant Thazhemadam <anant.thazhemadam@...il.com>
> > Cc: stable <stable@...r.kernel.org>
> > Link: https://lore.kernel.org/r/20201010082933.5417-1-anant.thazhemadam@gmail.com
> > Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> > Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> 
> Why duplicate Sign-off?

My scripts, I missed this :(