CVE-2022-49894 cxl/region: Fix region HPA ordering validation

In the Linux kernel, the following vulnerability has been resolved: cxl/region: Fix region HPA ordering validation Some regions may not have any address space allocated. Skip them when validating HPA order otherwise a crash like the following may result: devmcxladdregion: cxlacpi cxlacpi.0:...

CVE-2022-49894

CVE-2022-49894 affects the Linux kernel cxl region handling: PATCH fixes region HPA ordering validation to skip regions without address space, preventing a NULL pointer dereference and kernel crash in store_targetN() path (drivers/cxl/core/region.c). Descriptions show the crash trace and affected...