Re: [PATCH 1/4] target: Obtain se_node_acl->acl_kref during get_initiator_node_acl

[Bart Van Assche <bart.vanassche@sandisk.com>]

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.