blk-cgroup: fix UAF by grabbing blkcg lock before destroying blkg pd
This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v5.4.150 by commit d12ddd843f1877de1f7dd2aeea4907cf9ff3ac08. For more details please see the references link.