drm/panthor: Fix UAF race between device unplug and FW event processing

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: drm/panthor: Fix UAF race between device unplug and FW event processing The function panthor_fw_unplug() will free the FW memory sections. The problem is that there could still be pending FW events which are yet not handled at this point. process_fw_events_work() can in this case try to access said freed memory. Simply call disable_work_sync() to both drain and prevent future invocation of process_fw_events_work().

References

• https://git.kernel.org/stable/c/31db188355a49337e3e8ec98b99377e482eab22c
• https://git.kernel.org/stable/c/5e3ff56d4cb591daea70786d07dc21d06dc34108
• https://git.kernel.org/stable/c/6c1da9ae2c123a9ffda5375e64cc81f9ed3cc04a
• https://git.kernel.org/stable/c/7051f6ba968fa69918d72cc26de4d6cf7ea05b90