linux-kernel - [PATCH AUTOSEL 5.1 60/70] blk-mq: Fix memory leak in error handling

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Date:   Sat,  8 Jun 2019 07:39:39 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Jes Sorensen <jsorensen@...com>, Jens Axboe <axboe@...nel.dk>,
        Sasha Levin <sashal@...nel.org>, linux-block@...r.kernel.org
Subject: [PATCH AUTOSEL 5.1 60/70] blk-mq: Fix memory leak in error handling

From: Jes Sorensen <jsorensen@...com>

[ Upstream commit 41de54c64811bf087c8464fdeb43c6ad8be2686b ]

If blk_mq_init_allocated_queue() fails, make sure to free the poll
stat callback struct allocated.

Signed-off-by: Jes Sorensen <jsorensen@...com>
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 block/blk-mq.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/block/blk-mq.c b/block/blk-mq.c
index 8a41cc5974fe..95e8005982cd 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -2844,7 +2844,7 @@ struct request_queue *blk_mq_init_allocated_queue(struct blk_mq_tag_set *set,
 		goto err_exit;
 
 	if (blk_mq_alloc_ctxs(q))
-		goto err_exit;
+		goto err_poll;
 
 	/* init q->mq_kobj and sw queues' kobjects */
 	blk_mq_sysfs_init(q);
@@ -2905,6 +2905,9 @@ err_hctxs:
 	kfree(q->queue_hw_ctx);
 err_sys_init:
 	blk_mq_sysfs_deinit(q);
+err_poll:
+	blk_stat_free_callback(q->poll_cb);
+	q->poll_cb = NULL;
 err_exit:
 	q->mq_ops = NULL;
 	return ERR_PTR(-ENOMEM);
-- 
2.20.1