linux-kernel - Re: [PATCH AUTOSEL 4.19 592/671] USB: usb-skeleton: fix use-after-free after driver unbind

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Message-ID: <20200117102116.GS2301@localhost>
Date:   Fri, 17 Jan 2020 11:21:16 +0100
From:   Johan Hovold <johan@...nel.org>
To:     Sasha Levin <sashal@...nel.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Johan Hovold <johan@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org
Subject: Re: [PATCH AUTOSEL 4.19 592/671] USB: usb-skeleton: fix
 use-after-free after driver unbind

On Thu, Jan 16, 2020 at 12:03:50PM -0500, 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>

This one isn't needed in any stable tree. As we discussed before, the
skeleton driver is only there for documentation purposes. 

Johan