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

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Message-ID: <568F73D2.2090808@sandisk.com>
Date:	Fri, 8 Jan 2016 09:31:14 +0100
From:	Bart Van Assche <bart.vanassche@...disk.com>
To:	Christoph Hellwig <hch@....de>,
	"Nicholas A. Bellinger" <nab@...erainc.com>
CC:	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>,
	Nicholas Bellinger <nab@...ux-iscsi.org>
Subject: Re: [PATCH 1/4] target: Obtain se_node_acl->acl_kref during
 get_initiator_node_acl

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.

Bart.