linux-kernel - Re: [PATCH AUTOSEL 4.19 095/100] USB: usb-skeleton: fix use-after-free after driver unbind

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Message-ID: <20191029094321.GA582711@kroah.com>
Date:   Tue, 29 Oct 2019 10:43:21 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Sasha Levin <sashal@...nel.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Johan Hovold <johan@...nel.org>, linux-usb@...r.kernel.org
Subject: Re: [PATCH AUTOSEL 4.19 095/100] USB: usb-skeleton: fix
 use-after-free after driver unbind

On Tue, Oct 29, 2019 at 05:04:35AM -0400, Sasha Levin wrote:
> On Fri, Oct 18, 2019 at 06:22:05PM -0400, Greg Kroah-Hartman wrote:
> > On Fri, Oct 18, 2019 at 06:05:20PM -0400, Sasha Levin wrote:
> > > From: Johan Hovold <johan@...nel.org>
> > > 
> > > [ Upstream commit 6353001852776e7eeaab4da78922d4c6f2b076af ]
> > > 
> > > The driver failed to stop its read URB on disconnect, something which
> > > could lead to a use-after-free in the completion handler after driver
> > > unbind in case the character device has been closed.
> > > 
> > > Fixes: e7389cc9a7ff ("USB: skel_read really sucks royally")
> > > Signed-off-by: Johan Hovold <johan@...nel.org>
> > > Link: https://lore.kernel.org/r/20191009170944.30057-3-johan@kernel.org
> > > Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> > > Signed-off-by: Sasha Levin <sashal@...nel.org>
> > > ---
> > >  drivers/usb/usb-skeleton.c | 1 +
> > >  1 file changed, 1 insertion(+)
> > 
> > This file does not even get built in the kernel tree, no need to
> > backport anything for it :)
> 
> I'll drop it, but you're taking patches for this driver:
> https://lore.kernel.org/patchwork/patch/1140673/ .

Ah yeah, I probably shouldn't have taken stable backports for that, my
fault.

greg k-h