CVE-2025-38088 powerpc/powernv/memtrace: Fix out of bounds issue in memtrace mmap

In the Linux kernel, the following vulnerability has been resolved: powerpc/powernv/memtrace: Fix out of bounds issue in memtrace mmap memtrace mmap issue has an out of bounds issue. This patch fixes the by checking that the requested mapping region size should stay within the allocated region si...