cxl/pmem: Fix cxl_pmem_region and cxl_memdev leak

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: cxl/pmem: Fix cxl_pmem_region and cxl_memdev leak When a cxl_nvdimm object goes through a ->remove() event (device physically removed, nvdimm-bridge disabled, or nvdimm device disabled), then any associated regions must also be disabled. As highlighted by the cxl-create-region.sh test [1], a single device may host multiple regions, but the driver was only tracking one region at a time. This leads to a situation where only the last enabled region per nvdimm device is cleaned up properly. Other regions are leaked, and this also causes cxl_memdev reference leaks. Fix the tracking by allowing cxl_nvdimm objects to track multiple region associations.

References

• https://git.kernel.org/stable/c/f43b6bfdbab78606735ba81185cf0602b81e40b6
• https://git.kernel.org/stable/c/4d07ae22e79ebc2d7528bbc69daa53b86981cb3a