Re: [PATCH] wan/x25: Fix use-after-free in x25_asy_open_tty()

[David Miller]

From: Peter Hurley <peter@xxxxxxxxxxxxxxxxxx>
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@xxxxxxxxxx>
> Cc: <stable@xxxxxxxxxxxxxxx>
> Signed-off-by: Peter Hurley <peter@xxxxxxxxxxxxxxxxxx>

Applied, thanks.
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