CVE-2026-74570: kernel: ntfs: harden runlist realloc size calculations

Severity: Critical

CVSS Score: 9.8

In the Linux kernel, the following vulnerability has been resolved: ntfs: harden runlist realloc size calculations Add a shared helper to safely convert runlist element counts to byte sizes using overflow checks, and use it in both ntfs_rl_realloc() and ntfs_rl_realloc_nofail().