Bluetooth: vhci: Prevent use-after-free by removing debugfs files early

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: vhci: Prevent use-after-free by removing debugfs files early Move the creation of debugfs files into a dedicated function, and ensure they are explicitly removed during vhci_release(), before associated data structures are freed. Previously, debugfs files such as "force_suspend", "force_wakeup", and others were created under hdev->debugfs but not removed in vhci_release(). Since vhci_release() frees the backing vhci_data structure, any access to these files after release would result in use-after-free errors. Although hdev->debugfs is later freed in hci_release_dev(), user can access files after vhci_data is freed but before hdev->debugfs is released.

References

• https://git.kernel.org/stable/c/bd75eba88e88d7b896b0c737b02a74a12afc235f
• https://git.kernel.org/stable/c/1503756fffe76d5aea2371a4b8dee20c3577bcfd
• https://git.kernel.org/stable/c/7cc08f2f127b9a66f46ea918e34353811a7cb378
• https://git.kernel.org/stable/c/28010791193a4503f054e8d69a950ef815deb539