CVE-2022-49964 arm64: cacheinfo: Fix incorrect assignment of signed error value to unsigned fw_level

In the Linux kernel, the following vulnerability has been resolved: arm64: cacheinfo: Fix incorrect assignment of signed error value to unsigned fwlevel Though acpifindlastcachelevel always returned signed value and the document states it will return any errors caused by lack of a PPTT table, it...

kernel: arm64: cacheinfo: Fix incorrect assignment of signed error value to unsigned fw_level

An integer overflow exists in the linux kernel such that the value returned from acpifindlastcachelevel is then assigned to unsigned fwlevel, which will result in the number of cache leaves calculated incorrectly, resulting in damage to the confidentiality, integrity, and availability of the syst...