From mboxrd@z Thu Jan  1 00:00:00 1970
From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Tue, 09 Feb 2016 11:14:40 +0000
Subject: [patch] dm: check for kmalloc failure in dm_init_request_based_blk_mq_queue()
Message-Id: <20160209111440.GB23998@mwanda>
List-Id: <kernel-janitors.vger.kernel.org>
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To: Alasdair Kergon <agk@redhat.com>, Mike Snitzer <snitzer@redhat.com>
Cc: dm-devel@redhat.com, Shaohua Li <shli@kernel.org>, linux-raid@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org

We can just return -ENOMEM if the kzalloc() fails.

Fixes: 41b2facaf4ba ('dm: allocate blk_mq_tag_set rather than embed in mapped_device')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 6b7e80e..1a5f879 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -2736,6 +2736,8 @@ static int dm_init_request_based_blk_mq_queue(struct mapped_device *md,
 	int err;
 
 	md->tag_set = kzalloc(sizeof(struct blk_mq_tag_set), GFP_KERNEL);
+	if (!md->tag_set)
+		return -ENOMEM;
 	md->tag_set->ops = &dm_mq_ops;
 	md->tag_set->queue_depth = dm_get_blk_mq_queue_depth();
 	md->tag_set->numa_node = NUMA_NO_NODE;