ext4: fix bounds check in check_xattrs() to prevent out-of-bounds access

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Unity Linux 20.1050e / 20.1060e / 20.1070e Security Update: kernel (UTSA-2026-001654)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-001654 advisory. The ext4xattrcheckentries function in fs/ext4/xattr.c in the Linux kernel through 4.15.15 does not properly validate xattr sizes, which causes misinterpretation of a...