CVE-2023-52837

In the Linux kernel, the following vulnerability has been resolved:

nbd: fix uaf in nbd_open

Commit 4af5f2e03013 ("nbd: use blk_mq_alloc_disk and

blk_cleanup_disk") cleans up disk by blk_cleanup_disk() and it won't set

disk->private_data as NULL as before. UAF may be triggered in nbd_open()

if someone tries to open nbd device right after nbd_put() since nbd has

been free in nbd_dev_remove().

Fix this by implementing ->free_disk and free private data in it.