linux-kernel - [patch] dm: check for kmalloc failure in dm_init_request_based_blk_mq

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Date:	Tue, 9 Feb 2016 14:14:40 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Alasdair Kergon <agk@...hat.com>, Mike Snitzer <snitzer@...hat.com>
Cc:	dm-devel@...hat.com, Shaohua Li <shli@...nel.org>,
	linux-raid@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [patch] dm: check for kmalloc failure in
 dm_init_request_based_blk_mq_queue()

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@...cle.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;