linux-kernel - Re: [PATCH] target: close target_put_sess_cmd() vs. core_tmr_abort

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Message-ID: <20130319000411.GA6406@kroah.com>
Date:	Mon, 18 Mar 2013 17:04:11 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Jörn Engel <joern@...fs.org>
Cc:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>,
	linux-kernel@...r.kernel.org,
	target-devel <target-devel@...r.kernel.org>
Subject: Re: [PATCH] target: close target_put_sess_cmd() vs.
 core_tmr_abort_task() race

On Mon, Mar 18, 2013 at 06:28:53PM -0400, Jörn Engel wrote:
> It is possible for one thread to to take se_sess->sess_cmd_lock in
> core_tmr_abort_task() before taking a reference count on
> se_cmd->cmd_kref, while another thread in target_put_sess_cmd() drops
> se_cmd->cmd_kref before taking se_sess->sess_cmd_lock.
> 
> This introduces kref_put_and_lock() and uses it in
> target_put_sess_cmd() to close the race window.

We already have kref_put_mutex(), why not just call this
kref_put_spinlock()?

thanks,

greg k-h
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