netdev - Re: [RFC/PATCH] Bluetooth: prevent double l2cap_chan

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Date:	Mon, 21 May 2012 13:21:37 -0300
From:	Gustavo Padovan <gustavo@...ovan.org>
To:	Minho Ban <mhban@...sung.com>
Cc:	Marcel Holtmann <marcel@...tmann.org>,
	Johan Hedberg <johan.hedberg@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	linux-bluetooth@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC/PATCH] Bluetooth: prevent double l2cap_chan_destroy

Hi Minho,

* Minho Ban <mhban@...sung.com> [2012-05-21 09:56:40 +0900]:

> l2cap_sock_kill can be called in l2cap_sock_release and l2cap_sock_close_cb
> either. This lead l2cap_chan_destroy to be called twice for same channel.
> To prevent double list_del and double chan_put, chan_destroy should be protected
> with chan->refcnt and chan_list_lock so that reentrance could be forbidden.

Even if l2cap_sock_kill() is called twice it will call l2cap_chan_destroy()
only once. If this is not happening we just have a broken piece of code
somewhere else and not here.

	Gustavo
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