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| author | Seongjae Jeong <jsjlee1020@gmail.com> | 2026-09-18 13:39:22 +0000 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2026-09-30 17:08:19 +0000 |
| commit | 7566fec606d233f803e61f5ce37c54fbcdb00010 (patch) | |
| tree | 200b60e522dedfbfe1dc9eabfb8fb516daa23eff /include/uapi/linux/errqueue.h | |
| parent | 4faeea625cf730bb20f609f061ff81c9b6852931 (diff) | |
| download | linux-next-7566fec606d233f803e61f5ce37c54fbcdb00010.tar.gz linux-next-7566fec606d233f803e61f5ce37c54fbcdb00010.zip | |
f2fs: reject device aliasing without a multi-device configuration
A malformed F2FS image can enable F2FS_FEATURE_DEVICE_ALIAS without
providing a multi-device configuration. For a regular single-device
filesystem, f2fs_scan_devices() returns without allocating sbi->devs.
In this state, f2fs_dev_is_alloc_blocked() passes the device alias
feature check and dereferences FDEV(0), resulting in a NULL pointer
dereference during segment allocation.
Device aliasing requires at least one secondary device. Reject
superblocks that enable device aliasing without entries for both the
main and secondary devices in sanity_check_raw_super().
Fixes: eae3faf210bd ("f2fs: support dynamic reserve/release for device aliasing")
Reported-by: syzbot+ae5b8eb92ed40411ce16@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=ae5b8eb92ed40411ce16
Signed-off-by: Seongjae Jeong <jsjlee1020@gmail.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'include/uapi/linux/errqueue.h')
0 files changed, 0 insertions, 0 deletions