netdev - Re: [PATCH net] sctp: fix the issue sctp_diag uses lock_sock in rcu_read

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Date:   Fri, 30 Sep 2016 02:09:18 -0400 (EDT)
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, vyasevich@...il.com,
        daniel@...earbox.net
Subject: Re: [PATCH net] sctp: fix the issue sctp_diag uses lock_sock in
 rcu_read_lock

From: Xin Long <lucien.xin@...il.com>
Date: Thu, 29 Sep 2016 02:55:44 +0800

> When sctp dumps all the ep->assocs, it needs to lock_sock first,
> but now it locks sock in rcu_read_lock, and lock_sock may sleep,
> which would break rcu_read_lock.
> 
> This patch is to get and hold one sock when traversing the list.
> After that and get out of rcu_read_lock, lock and dump it. Then
> it will traverse the list again to get the next one until all
> sctp socks are dumped.
> 
> For sctp_diag_dump_one, it fixes this issue by holding asoc and
> moving cb() out of rcu_read_lock in sctp_transport_lookup_process.
> 
> Fixes: 8f840e47f190 ("sctp: add the sctp_diag.c file")
> Signed-off-by: Xin Long <lucien.xin@...il.com>

Applied and queued up for -stable, thanks.