netdev - Re: [Patch net] af_unix: move unix

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Date:   Tue, 24 Jan 2017 14:31:39 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     xiyou.wangcong@...il.com
Cc:     netdev@...r.kernel.org, dvyukov@...gle.com,
        rweikusat@...ileactivedefense.com, viro@...iv.linux.org.uk
Subject: Re: [Patch net] af_unix: move unix_mknod() out of bindlock

From: Cong Wang <xiyou.wangcong@...il.com>
Date: Mon, 23 Jan 2017 11:17:35 -0800

> Dmitry reported a deadlock scenario:
> 
> unix_bind() path:
> u->bindlock ==> sb_writer
> 
> do_splice() path:
> sb_writer ==> pipe->mutex ==> u->bindlock
> 
> In the unix_bind() code path, unix_mknod() does not have to
> be done with u->bindlock held, since it is a pure fs operation,
> so we can just move unix_mknod() out.
> 
> Reported-by: Dmitry Vyukov <dvyukov@...gle.com>
> Tested-by: Dmitry Vyukov <dvyukov@...gle.com>
> Cc: Rainer Weikusat <rweikusat@...ileactivedefense.com>
> Cc: Al Viro <viro@...iv.linux.org.uk>
> Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>

Applied and queued up for -stable, thanks.