ntfs: reject invalid MFT LCNs from boot sector

Browse source

The NTFS boot sector stores the MFT and MFTMirr locations as unsigned
64-bit LCNs, but parse_ntfs_boot_sector() decoded them into an s64.

A crafted high-bit value could therefore become negative and pass
the existing upper-bound check. The invalid value then propagated into
the MFT zone allocator and could result in an out-of-bounds access to
lcn_empty_bits_per_page.

Fixes: 11ccc9107d ("ntfs: update runlist handling and cluster allocator")
Reported-by: Robert Morris <rtm@csail.mit.edu>
Closes: https://lore.kernel.org/all/57514.1787000602@localhost
Cc: stable@vger.kernel.org
Signed-off-by: Hyunchul Lee <hyc.lee@gmail.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>

...

This commit is contained in:

Hyunchul Lee 2026-08-19 16:19:00 +09:00 • committed by Namjae Jeon

parent d9e00c457d

commit cc9d09fef7

1 changed files with 6 additions and 6 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

12

fs/ntfs/super.c

View file