Description
In the Linux kernel, the following vulnerability has been resolved: ntfs: fix off-by-one page overflow in ntfs_decompress() The per-token range check in ntfs_decompress() uses if (cb >= cb_sb_end || dp_addr > dp_sb_end) break; so dp_addr == dp_sb_end falls through to the symbol copy `*dp_addr++ = *cb++`, writing one byte past the destination page. Since NTFS_SB_SIZE == PAGE_SIZE the destination is a single page, so the byte lands in the adjacent page, and *dest_ofs is left one past the sub-block end (the later `*dest_ofs &= ~PAGE_MASK` then yields 1, not 0, so the page is never finalized and later sub-blocks keep writing further past it). A corrupted compressed $DATA attribute thus produces a bounded run of out-of-bounds writes when the file is read. Break as soon as dp_addr reaches dp_sb_end; a full sub-block still completes, as its final copy advances dp_addr to exactly dp_sb_end.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
1e9ea7e04472d4e5e12e58c881eaacfb3e49b669 to < b42644e425fed4a5cd6c88372655da5c1b52c666affected1e9ea7e04472d4e5e12e58c881eaacfb3e49b669 to < 98716c9fce21f6c8a9d71e08cf53e7504fa562f4affected
Linux Linux
Default version status: affected
7.1affected0 to < 7.1unaffected7.2.6 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected