CVE-2023-52864

In the Linux kernel, the following vulnerability has been resolved:
platform/x86: wmi: Fix opening of char device Since commit fa1f68db6ca7
(“drivers: misc: pass miscdevice pointer via file private data”), the
miscdevice stores a pointer to itself inside filp->private_data, which
means that private_data will not be NULL when wmi_char_open() is called.
This might cause memory corruption should wmi_char_open() be unable to find
its driver, something which can happen when the associated WMI device is
deleted in wmi_free_devices(). Fix the problem by using the miscdevice
pointer to retrieve the WMI device data associated with a char device using
container_of(). This also avoids wmi_char_open() picking a wrong WMI device
bound to a driver with the same name as the original driver.