From: Xin Long <lucien.xin@xxxxxxxxx>
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@xxxxxxxxxx>
> Signed-off-by: Xin Long <lucien.xin@xxxxxxxxx>
Applied.
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