CVE-2025-22090 x86/mm/pat: Fix VM_PAT handling when fork() fails in copy_page_range()

In the Linux kernel, the following vulnerability has been resolved: x86/mm/pat: Fix VMPAT handling when fork fails in copypagerange If trackpfncopy fails, we already added the dst VMA to the maple tree. As fork fails, we'll cleanup the maple tree, and stumble over the dst VMA for which we neither...