linux-kernel - [PATCH 4.4 29/57] scsi: core: Put .shost_dev in failure path if host state changes to RUNNING

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Message-Id: <20210628144256.34524-30-sashal@kernel.org>
Date:   Mon, 28 Jun 2021 10:42:28 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Ming Lei <ming.lei@...hat.com>,
        Bart Van Assche <bvanassche@....org>,
        Hannes Reinecke <hare@...e.de>,
        John Garry <john.garry@...wei.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.4 29/57] scsi: core: Put .shost_dev in failure path if host state changes to RUNNING

From: Ming Lei <ming.lei@...hat.com>

[ Upstream commit 11714026c02d613c30a149c3f4c4a15047744529 ]

scsi_host_dev_release() only frees dev_name when host state is
SHOST_CREATED. After host state has changed to SHOST_RUNNING,
scsi_host_dev_release() no longer cleans up.

Fix this by doing a put_device(&shost->shost_dev) in the failure path when
host state is SHOST_RUNNING. Move get_device(&shost->shost_gendev) before
device_add(&shost->shost_dev) so that scsi_host_cls_release() can do a put
on this reference.

Link: https://lore.kernel.org/r/20210602133029.2864069-4-ming.lei@redhat.com
Cc: Bart Van Assche <bvanassche@....org>
Cc: Hannes Reinecke <hare@...e.de>
Reported-by: John Garry <john.garry@...wei.com>
Tested-by: John Garry <john.garry@...wei.com>
Reviewed-by: John Garry <john.garry@...wei.com>
Reviewed-by: Hannes Reinecke <hare@...e.de>
Signed-off-by: Ming Lei <ming.lei@...hat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/scsi/hosts.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/hosts.c b/drivers/scsi/hosts.c
index fb4b6034f644..636548030046 100644
--- a/drivers/scsi/hosts.c
+++ b/drivers/scsi/hosts.c
@@ -259,12 +259,11 @@ int scsi_add_host_with_dma(struct Scsi_Host *shost, struct device *dev,
 
 	device_enable_async_suspend(&shost->shost_dev);
 
+	get_device(&shost->shost_gendev);
 	error = device_add(&shost->shost_dev);
 	if (error)
 		goto out_del_gendev;
 
-	get_device(&shost->shost_gendev);
-
 	if (shost->transportt->host_size) {
 		shost->shost_data = kzalloc(shost->transportt->host_size,
 					 GFP_KERNEL);
@@ -300,6 +299,11 @@ int scsi_add_host_with_dma(struct Scsi_Host *shost, struct device *dev,
  out_del_dev:
 	device_del(&shost->shost_dev);
  out_del_gendev:
+	/*
+	 * Host state is SHOST_RUNNING so we have to explicitly release
+	 * ->shost_dev.
+	 */
+	put_device(&shost->shost_dev);
 	device_del(&shost->shost_gendev);
  out_destroy_freelist:
 	scsi_destroy_command_freelist(shost);
-- 
2.30.2