linux-kernel - Re: [PATCH 1/1] ax25: Fix segfault after sock connection timeout

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Message-Id: <20170116.144051.1777999685832100508.davem@davemloft.net>
Date:   Mon, 16 Jan 2017 14:40:51 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     basil@...abunga.com
Cc:     jreuter@...na.de, ralf@...ux-mips.org, linux-hams@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, mcdermj@...otropic.com, f6bvp@...e.fr
Subject: Re: [PATCH 1/1] ax25: Fix segfault after sock connection timeout

From: Basil Gunn <basil@...abunga.com>
Date: Sat, 14 Jan 2017 12:18:55 -0800

> The ax.25 socket connection timed out & the sock struct has been
> previously taken down ie. sock struct is now a NULL pointer. Checking
> the sock_flag causes the segfault.  Check if the socket struct pointer
> is NULL before checking sock_flag. This segfault is seen in
> timed out netrom connections.
> 
> Please submit to -stable.
> 
> Signed-off-by: Basil Gunn <basil@...abunga.com>

This is consistent with the ax25->sk NULL check later in this function.

Applied and queued up for -stable, thanks.