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media: mc: Clear minor number before put device 

The device minor should not be cleared after the device is released.

Fixes: 9e14868dc952 ("media: mc: Clear minor number reservation at unregistration time")
Cc: stable@vger.kernel.org
Reported-by: syzbot+031d0cfd7c362817963f@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=031d0cfd7c362817963f
Tested-by: syzbot+031d0cfd7c362817963f@syzkaller.appspotmail.com
Signed-off-by: Edward Adam Davis <eadavis@qq.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>
This commit is contained in:
Edward Adam Davis 2025-09-10 09:15:27 +08:00 committed by Hans Verkuil
parent 895d3b4b58
commit 8cfc8cec1b
1 changed files with 1 additions and 4 deletions
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5
drivers/media/mc/mc-devnode.c
View File

@ -276,13 +276,10 @@ void media_devnode_unregister(struct media_devnode *devnode)
/* Delete the cdev on this minor as well */
cdev_device_del(&devnode->cdev, &devnode->dev);
devnode->media_dev = NULL;
clear_bit(devnode->minor, media_devnode_nums);
mutex_unlock(&media_devnode_lock);
put_device(&devnode->dev);
mutex_lock(&media_devnode_lock);
clear_bit(devnode->minor, media_devnode_nums);
mutex_unlock(&media_devnode_lock);
}
/*