fix(vfs): saturate remaining XFS AG-offset and extent end_offset arithmetic#135
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…hmetic Sibling sites to #134 (same parsed-byte overflow class, found by a subsystem-wide sweep): - xfs.rs read_ag_headers: i * sb_agblocks * sb_blocksize (+ sb_sectsize) is the same three-way product of parsed superblock geometry as inode_offset; a crafted superblock overflows it during mount. Saturate so an out-of-range AG offset fails the read instead of panicking. - xfs_inode.rs XfsExtent::end_offset: startoff + blockcount mirrors the contains() overflow fixed in #134. Use saturating_add.
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Sibling sites to #134 (same parsed-byte overflow class, subsystem-wide sweep):
xfs.rsread_ag_headers:i * sb_agblocks * sb_blocksize (+ sb_sectsize)— same three-way product of parsed superblock geometry asinode_offset; a crafted superblock overflows it during mount. Saturate so an out-of-range AG offset fails the read instead of panicking.xfs_inode.rsXfsExtent::end_offset:startoff + blockcountmirrors thecontains()overflow fixed in fix(vfs): saturate/checked XFS extent and inode-offset arithmetic #134. Use saturating_add.