From: Bart Van Assche <bart.vanassche@sandisk.com>
To: Christoph Hellwig <hch@lst.de>,
"Nicholas A. Bellinger" <nab@daterainc.com>
Cc: target-devel <target-devel@vger.kernel.org>,
linux-scsi <linux-scsi@vger.kernel.org>,
lkml <linux-kernel@vger.kernel.org>,
Sagi Grimberg <sagig@mellanox.com>,
Hannes Reinecke <hare@suse.de>, Andy Grover <agrover@redhat.com>,
Vasu Dev <vasu.dev@linux.intel.com>, Vu Pham <vu@mellanox.com>,
Nicholas Bellinger <nab@linux-iscsi.org>
Subject: Re: [PATCH 1/4] target: Obtain se_node_acl->acl_kref during get_initiator_node_acl
Date: Fri, 8 Jan 2016 09:31:14 +0100 [thread overview]
Message-ID: <568F73D2.2090808@sandisk.com> (raw)
In-Reply-To: <20160108081412.GA32138@lst.de>
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.
next prev parent reply other threads:[~2016-01-08 8:31 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-08 7:15 [PATCH 0/4] target: Close se_node_acl lookup race Nicholas A. Bellinger
2016-01-08 7:15 ` [PATCH 1/4] target: Obtain se_node_acl->acl_kref during get_initiator_node_acl Nicholas A. Bellinger
2016-01-08 8:14 ` Christoph Hellwig
2016-01-08 8:31 ` Bart Van Assche [this message]
2016-01-08 8:35 ` Christoph Hellwig
2016-01-08 8:47 ` Nicholas A. Bellinger
2016-01-08 9:08 ` Christoph Hellwig
2016-01-08 9:37 ` Christoph Hellwig
2016-01-08 7:15 ` [PATCH 2/4] target: Remove useless set_initiator_node_queue_depth acl lookup Nicholas A. Bellinger
2016-01-08 8:17 ` Christoph Hellwig
2016-01-08 7:15 ` [PATCH 3/4] tcm_fc: Convert acl lookup to modern get_initiator_node_acl usage Nicholas A. Bellinger
2016-01-08 8:21 ` Christoph Hellwig
2016-01-08 9:05 ` Christoph Hellwig
2016-01-08 7:15 ` [PATCH 4/4] ib_srpt: " Nicholas A. Bellinger
2016-01-08 8:52 ` Bart Van Assche
2016-01-08 9:17 ` Nicholas A. Bellinger
2016-01-08 9:35 ` Bart Van Assche
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