在 2023/11/3 16:12, Christoph Hellwig 写道:
On Fri, Nov 03, 2023 at 06:13:34PM +0800, Li Lingfeng wrote:From: Li Lingfeng <lilingfeng3@xxxxxxxxxx> 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 refcount of nbd device is zero and private_data is not NULL.I don't think this is the right fix. nbd needs to move to ->free_disk to free it's private data.
Thanks for your advice, I will send v2 soon.
