linux-kernel - Re: [PATCH] wan/x25: Fix use-after-free in x25_asy_open

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Message-Id: <20151201.151802.2271909049212392672.davem@davemloft.net>
Date:	Tue, 01 Dec 2015 15:18:02 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	peter@...leysoftware.com
Cc:	gregkh@...uxfoundation.org, jslaby@...e.cz,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	sasha.levin@...cle.com, stable@...r.kernel.org
Subject: Re: [PATCH] wan/x25: Fix use-after-free in x25_asy_open_tty()

From: Peter Hurley <peter@...leysoftware.com>
Date: Fri, 27 Nov 2015 14:18:39 -0500

> The N_X25 line discipline may access the previous line discipline's closed
> and already-freed private data on open [1].
> 
> The tty->disc_data field _never_ refers to valid data on entry to the
> line discipline's open() method. Rather, the ldisc is expected to
> initialize that field for its own use for the lifetime of the instance
> (ie. from open() to close() only).
 ...
> Reported-and-tested-by: Sasha Levin <sasha.levin@...cle.com>
> Cc: <stable@...r.kernel.org>
> Signed-off-by: Peter Hurley <peter@...leysoftware.com>

Applied, thanks.
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