CVE-2024-56764: ublk: detach gendisk from ublk device if add_disk() fails

First published: Mon Jan 06 2025(Updated: )

In the Linux kernel, the following vulnerability has been resolved: ublk: detach gendisk from ublk device if add_disk() fails Inside ublk_abort_requests(), gendisk is grabbed for aborting all inflight requests. And ublk_abort_requests() is called when exiting the uring context or handling timeout. If add_disk() fails, the gendisk may have been freed when calling ublk_abort_requests(), so use-after-free can be caused when getting disk's reference in ublk_abort_requests(). Fixes the bug by detaching gendisk from ublk device if add_disk() fails.

Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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