CVE-2022-49505: Use After Free

In the Linux kernel, the following vulnerability has been resolved: NFC: NULL out the dev-rfkill to prevent UAF Commit 3e3b5dfcd16a "NFC: reorder the logic in nfcun,registerdevice" assumes the deviceisregistered in function nfcdevup will help to check when the rfkill is unregistered. However, thi...