linux-kernel - [PATCH 4.10 39/93] dm rq: check blk_mq_register_dev() return value in dm_mq_init_request

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Date:   Thu, 18 May 2017 12:47:08 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Bart Van Assche <bart.vanassche@...disk.com>,
        Hannes Reinecke <hare@...e.com>,
        Christoph Hellwig <hch@....de>,
        Mike Snitzer <snitzer@...hat.com>
Subject: [PATCH 4.10 39/93] dm rq: check blk_mq_register_dev() return value in dm_mq_init_request_queue()

4.10-stable review patch.  If anyone has any objections, please let me know.

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

From: Bart Van Assche <bart.vanassche@...disk.com>

commit 23a601248958fa4142d49294352fe8d1fdf3e509 upstream.

Otherwise the request-based DM blk-mq request_queue will be put into
service without being properly exported via sysfs.

Signed-off-by: Bart Van Assche <bart.vanassche@...disk.com>
Reviewed-by: Hannes Reinecke <hare@...e.com>
Cc: Christoph Hellwig <hch@....de>
Signed-off-by: Mike Snitzer <snitzer@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/md/dm-rq.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/drivers/md/dm-rq.c
+++ b/drivers/md/dm-rq.c
@@ -961,10 +961,14 @@ int dm_mq_init_request_queue(struct mapp
 	dm_init_md_queue(md);
 
 	/* backfill 'mq' sysfs registration normally done in blk_register_queue */
-	blk_mq_register_dev(disk_to_dev(md->disk), q);
+	err = blk_mq_register_dev(disk_to_dev(md->disk), q);
+	if (err)
+		goto out_cleanup_queue;
 
 	return 0;
 
+out_cleanup_queue:
+	blk_cleanup_queue(q);
 out_tag_set:
 	blk_mq_free_tag_set(md->tag_set);
 out_kfree_tag_set: