Juntong Deng 64933ab7b0 fs/jfs: Add validity check for db_maxag and db_agpref
Both db_maxag and db_agpref are used as the index of the
db_agfree array, but there is currently no validity check for
db_maxag and db_agpref, which can lead to errors.

The following is related bug reported by Syzbot:

UBSAN: array-index-out-of-bounds in fs/jfs/jfs_dmap.c:639:20
index 7936 is out of range for type 'atomic_t[128]'

Add checking that the values of db_maxag and db_agpref are valid
indexes for the db_agfree array.

Reported-by: syzbot+38e876a8aa44b7115c76@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=38e876a8aa44b7115c76
Signed-off-by: Juntong Deng <juntong.deng@outlook.com>
Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
2023-10-03 18:41:12 -05:00
..
2023-07-24 10:30:01 +02:00
2022-04-25 14:00:33 -05:00
2023-08-31 15:25:01 -07:00
2022-04-25 14:00:33 -05:00
2023-08-31 15:25:01 -07:00
2021-10-18 14:43:23 -06:00