CVE-2022-49896

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