linux-kernel - [PATCH 3.16 240/245] [media] media-devnode: add missing mutex lock in error handler

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Message-ID: <lsq.1587683028.792912257@decadent.org.uk>
Date:   Fri, 24 Apr 2020 00:07:47 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Max Kellermann" <max@...mpel.org>,
        "Mauro Carvalho Chehab" <mchehab@....samsung.com>
Subject: [PATCH 3.16 240/245] [media] media-devnode: add missing mutex
 lock in error handler

3.16.83-rc1 review patch.  If anyone has any objections, please let me know.

------------------

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@...adent.org.uk>
---
 drivers/media/media-devnode.c | 3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/media/media-devnode.c
+++ b/drivers/media/media-devnode.c
@@ -282,8 +282,11 @@ int __must_check media_devnode_register(
 	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;
 }