linux-kernel - [PATCH] rapidio: devices: Fix missing put_device in mport_cdev

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Date:   Sat, 3 Dec 2022 08:57:21 +0000
From:   Cai Xinchen <caixinchen1@...wei.com>
To:     <mporter@...nel.crashing.org>, <alex.bou9@...il.com>,
        <akpm@...ux-foundation.org>, <jakobkoschel@...il.com>,
        <wangweiyang2@...wei.com>, <jhubbard@...dia.com>,
        <yangyingliang@...wei.com>, <error27@...il.com>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH] rapidio: devices: Fix missing put_device in mport_cdev_open

When kfifo_alloc fails, the refcount of chdev->dev is left incremental.
We should use put_device(&chdev->dev) to decrease the ref count of
chdev->dev to avoid refcount leak.

Fixes: e8de370188d0 ("rapidio: add mport char device driver")
Signed-off-by: Cai Xinchen <caixinchen1@...wei.com>
---
 drivers/rapidio/devices/rio_mport_cdev.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/rapidio/devices/rio_mport_cdev.c b/drivers/rapidio/devices/rio_mport_cdev.c
index fecf523f36d8..43db495f1986 100644
--- a/drivers/rapidio/devices/rio_mport_cdev.c
+++ b/drivers/rapidio/devices/rio_mport_cdev.c
@@ -1912,6 +1912,7 @@ static int mport_cdev_open(struct inode *inode, struct file *filp)
 			  sizeof(struct rio_event) * MPORT_EVENT_DEPTH,
 			  GFP_KERNEL);
 	if (ret < 0) {
+		put_device(&chdev->dev);
 		dev_err(&chdev->dev, DRV_NAME ": kfifo_alloc failed\n");
 		ret = -ENOMEM;
 		goto err_fifo;
-- 
2.17.1