linux-kernel - [PATCH 4.4 15/65] media-devnode: add missing mutex lock in error handler

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Message-Id: <20200526183911.693569472@linuxfoundation.org>
Date:   Tue, 26 May 2020 20:52:34 +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, Max Kellermann <max@...mpel.org>,
        Mauro Carvalho Chehab <mchehab@....samsung.com>,
        Ben Hutchings <ben.hutchings@...ethink.co.uk>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.4 15/65] media-devnode: add missing mutex lock in error handler

From: Max Kellermann <max@...mpel.org>

commit 88336e174645948da269e1812f138f727cd2896b upstream.

We should protect the device unregister patch too, at the error
condition.

Signed-off-by: Max Kellermann <max@...mpel.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@....samsung.com>
Signed-off-by: Ben Hutchings <ben.hutchings@...ethink.co.uk>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/media/media-devnode.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/media/media-devnode.c b/drivers/media/media-devnode.c
index 6c56aebd8db0..86c7c3732c84 100644
--- a/drivers/media/media-devnode.c
+++ b/drivers/media/media-devnode.c
@@ -282,8 +282,11 @@ int __must_check media_devnode_register(struct media_devnode *mdev,
 	return 0;
 
 error:
+	mutex_lock(&media_devnode_lock);
 	cdev_del(&mdev->cdev);
 	clear_bit(mdev->minor, media_devnode_nums);
+	mutex_unlock(&media_devnode_lock);
+
 	return ret;
 }
 
-- 
2.25.1