linux-kernel - Re: [PATCH -next 0/9] tty: Fix buffer work access-after-free

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Message-ID: <50C63157.6000601@ilyx.ru>
Date:	Mon, 10 Dec 2012 23:00:39 +0400
From:	Ilya Zykov <ilya@...x.ru>
To:	Peter Hurley <peter@...leysoftware.com>
CC:	Alan Cox <alan@...ux.intel.com>, Jiri Slaby <jslaby@...e.cz>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next 0/9] tty: Fix buffer work access-after-free

On 04.12.2012 11:07, Peter Hurley wrote:
> 
> The most common cause stems from the n_tty_close() path spuriously
> scheduling buffer work, when the ldisc has already been halted.
> This is fixed in 'tty: Don't reschedule buffer work while closing'

Thank you, 
very useful.
Fix this:

WARNING: at drivers/tty/tty_buffer.c:429 flush_to_ldisc+0x52/0x192()
Hardware name: P5K Premium
tty is NULL
...
Pid: 1394, comm: kworker/0:2 Tainted: P        W  O 3.7.0-rc8-next-20121210-debtty.1+ #4
Call Trace:
 [<ffffffff8102d2f8>] warn_slowpath_common+0x80/0x98
 [<ffffffff8102d3a4>] warn_slowpath_fmt+0x41/0x43
 [<ffffffff8119c53a>] flush_to_ldisc+0x52/0x192
 [<ffffffff812594bd>] ? __schedule+0x5dd/0x60c
 [<ffffffff8103f146>] process_one_work+0x1c1/0x279
 [<ffffffff8119c4e8>] ? tty_buffer_free_all+0x4d/0x4d
 [<ffffffff8104104b>] worker_thread+0x154/0x24e
 [<ffffffff81040ef7>] ? manage_workers+0x26c/0x26c
 [<ffffffff810446ef>] kthread+0xb0/0xb8
 [<ffffffff8104463f>] ? kthread_parkme+0x1f/0x1f
 [<ffffffff8125f7ec>] ret_from_fork+0x7c/0xb0
 [<ffffffff8104463f>] ? kthread_parkme+0x1f/0x1f

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