netdev - Re: [PATCH net 1/2] caif: Bugfix list_del_rcu race in cfmuxl

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Date:	Thu, 02 Feb 2012 14:31:02 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	sjur.brandeland@...ricsson.com
Cc:	netdev@...r.kernel.org, sjurbren@...il.com
Subject: Re: [PATCH net 1/2] caif: Bugfix list_del_rcu race in
 cfmuxl_ctrlcmd.

From: Sjur Brændeland <sjur.brandeland@...ricsson.com>
Date: Thu,  2 Feb 2012 12:21:02 +0100

> Always use cfmuxl_remove_uplayer when removing a up-layer.
> cfmuxl_ctrlcmd() can be called independently and in parallel with
> cfmuxl_remove_uplayer(). The race between them could cause list_del_rcu
> to be called on a node which has been already taken out from the list.
> That lead to a (rare) crash on accessing poisoned node->prev inside
> list_del_rcu.
> 
> This fix ensures that deletion are done holding the same lock.
> 
> Reported-by: Dmitry Tarnyagin <dmitry.tarnyagin@...ricsson.com>
> Signed-off-by: Sjur Brændeland <sjur.brandeland@...ricsson.com>

Applied.
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