netdev - Re: [PATCH net] sctp: call rcu_read_lock before checking for duplicate transport nodes

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Date:   Wed, 01 Mar 2017 12:51:44 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     lucien.xin@...il.com
Cc:     netdev@...r.kernel.org, linux-sctp@...r.kernel.org,
        marcelo.leitner@...il.com, nhorman@...driver.com,
        vyasevich@...il.com, andreyknvl@...gle.com
Subject: Re: [PATCH net] sctp: call rcu_read_lock before checking for
 duplicate transport nodes

From: Xin Long <lucien.xin@...il.com>
Date: Tue, 28 Feb 2017 12:41:29 +0800

> Commit cd2b70875058 ("sctp: check duplicate node before inserting a
> new transport") called rhltable_lookup() to check for the duplicate
> transport node in transport rhashtable.
> 
> But rhltable_lookup() doesn't call rcu_read_lock inside, it could cause
> a use-after-free issue if it tries to dereference the node that another
> cpu has freed it. Note that sock lock can not avoid this as it is per
> sock.
> 
> This patch is to fix it by calling rcu_read_lock before checking for
> duplicate transport nodes.
> 
> Fixes: cd2b70875058 ("sctp: check duplicate node before inserting a new transport")
> Reported-by: Andrey Konovalov <andreyknvl@...gle.com>
> Signed-off-by: Xin Long <lucien.xin@...il.com>

Applied.