linux-kernel - Re: [PATCH 1/4] target: Obtain se_node_acl->acl_kref during get_initiator_node

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Date:	Fri, 08 Jan 2016 00:47:39 -0800
From:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
To:	Bart Van Assche <bart.vanassche@...disk.com>
Cc:	Christoph Hellwig <hch@....de>,
	"Nicholas A. Bellinger" <nab@...erainc.com>,
	target-devel <target-devel@...r.kernel.org>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Sagi Grimberg <sagig@...lanox.com>,
	Hannes Reinecke <hare@...e.de>,
	Andy Grover <agrover@...hat.com>,
	Vasu Dev <vasu.dev@...ux.intel.com>, Vu Pham <vu@...lanox.com>
Subject: Re: [PATCH 1/4] target: Obtain se_node_acl->acl_kref during
 get_initiator_node_acl

On Fri, 2016-01-08 at 09:31 +0100, Bart Van Assche wrote:
> On 01/08/2016 09:14 AM, Christoph Hellwig wrote:
> >>   	mutex_lock(&tpg->acl_node_mutex);
> >>   	acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
> >> +	/*
> >> +	 * Obtain the acl_kref now, which will be dropped upon the
> >> +	 * release of se_sess memory within transport_free_session().
> >> +	 */
> >> +	if (acl)
> >> +		kref_get(&acl->acl_kref);
> >
> > І think the comment is highly confusing as it's about one of the
> > callers, while the function has many.
> >
> > I'd suggest you move it to core_tpg_check_initiator_node_acl instead.
> >
> > Also I think iscsit_build_sendtargets_response will need a put on
> > the nacl, otherwise you'll leak references.
> 
> Indeed. All error paths in all target drivers will have to be modified 
> to avoid that an acl reference leak is triggered if 
> transport_init_session() fails after core_tpg_check_initiator_node_acl() 
> succeeded.
> 

Actually no, they do not.  That's the way that everything outside of
tcm_fc + ib_srpt driver code has already worked for a long time.