linux-kernel - [PATCH 3.4 116/146] target/pscsi: Don't leak scsi_host if hba is VIRTUAL

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Date:	Tue, 15 Sep 2015 17:03:51 +0800
From:	lizf@...nel.org
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Andy Grover <agrover@...hat.com>,
	Nicholas Bellinger <nab@...ux-iscsi.org>,
	Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 116/146] target/pscsi: Don't leak scsi_host if hba is VIRTUAL_HOST

From: Andy Grover <agrover@...hat.com>

3.4.109-rc1 review patch.  If anyone has any objections, please let me know.

------------------


commit 5a7125c64def3b21f8147eca8b54949a60963942 upstream.

See https://bugzilla.redhat.com/show_bug.cgi?id=1025672

We need to put() the reference to the scsi host that we got in
pscsi_configure_device(). In VIRTUAL_HOST mode it is associated with
the dev_virt, not the hba_virt.

Signed-off-by: Andy Grover <agrover@...hat.com>
Signed-off-by: Nicholas Bellinger <nab@...ux-iscsi.org>
[lizf: Backported to 3.4: adjust context]
Signed-off-by: Zefan Li <lizefan@...wei.com>
---
 drivers/target/target_core_pscsi.c | 3 +++
 drivers/target/target_core_pscsi.h | 1 +
 2 files changed, 4 insertions(+)

diff --git a/drivers/target/target_core_pscsi.c b/drivers/target/target_core_pscsi.c
index 8082674..ec7e71c 100644
--- a/drivers/target/target_core_pscsi.c
+++ b/drivers/target/target_core_pscsi.c
@@ -567,6 +567,7 @@ static struct se_device *pscsi_create_virtdevice(
 					" pdv_host_id: %d\n", pdv->pdv_host_id);
 				return ERR_PTR(-EINVAL);
 			}
+			pdv->pdv_lld_host = sh;
 		}
 	} else {
 		if (phv->phv_mode == PHV_VIRTUAL_HOST_ID) {
@@ -653,6 +654,8 @@ static void pscsi_free_device(void *p)
 		if ((phv->phv_mode == PHV_LLD_SCSI_HOST_NO) &&
 		    (phv->phv_lld_host != NULL))
 			scsi_host_put(phv->phv_lld_host);
+		else if (pdv->pdv_lld_host)
+			scsi_host_put(pdv->pdv_lld_host);
 
 		if ((sd->type == TYPE_DISK) || (sd->type == TYPE_ROM))
 			scsi_device_put(sd);
diff --git a/drivers/target/target_core_pscsi.h b/drivers/target/target_core_pscsi.h
index 43f1c41..6c23c94 100644
--- a/drivers/target/target_core_pscsi.h
+++ b/drivers/target/target_core_pscsi.h
@@ -45,6 +45,7 @@ struct pscsi_dev_virt {
 	int	pdv_lun_id;
 	struct block_device *pdv_bd;
 	struct scsi_device *pdv_sd;
+	struct Scsi_Host *pdv_lld_host;
 	struct se_hba *pdv_se_hba;
 } ____cacheline_aligned;
 
-- 
1.9.1

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