diff options
| author | Ryusuke Konishi <konishi.ryusuke@gmail.com> | 2025-07-10 22:49:08 +0900 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2025-07-19 19:26:16 -0700 |
| commit | 4aead50caf67e01020c8be1945c3201e8a972a27 (patch) | |
| tree | 3776af94f91a5512b33ca9789c1844c07e3ffe55 | |
| parent | 7563fcbfd484b347b776aeed4d7dac78b30884aa (diff) | |
nilfs2: reject invalid file types when reading inodes
To prevent inodes with invalid file types from tripping through the vfs
and causing malfunctions or assertion failures, add a missing sanity check
when reading an inode from a block device. If the file type is not valid,
treat it as a filesystem error.
Link: https://lkml.kernel.org/r/20250710134952.29862-1-konishi.ryusuke@gmail.com
Fixes: 05fe58fdc10d ("nilfs2: inode operations")
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Reported-by: syzbot+895c23f6917da440ed0d@syzkaller.appspotmail.com
Link: https://syzkaller.appspot.com/bug?extid=895c23f6917da440ed0d
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
| -rw-r--r-- | fs/nilfs2/inode.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/fs/nilfs2/inode.c b/fs/nilfs2/inode.c index 6613b8fcceb0..5cf7328d5360 100644 --- a/fs/nilfs2/inode.c +++ b/fs/nilfs2/inode.c @@ -472,11 +472,18 @@ static int __nilfs_read_inode(struct super_block *sb, inode->i_op = &nilfs_symlink_inode_operations; inode_nohighmem(inode); inode->i_mapping->a_ops = &nilfs_aops; - } else { + } else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) || + S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) { inode->i_op = &nilfs_special_inode_operations; init_special_inode( inode, inode->i_mode, huge_decode_dev(le64_to_cpu(raw_inode->i_device_code))); + } else { + nilfs_error(sb, + "invalid file type bits in mode 0%o for inode %lu", + inode->i_mode, ino); + err = -EIO; + goto failed_unmap; } nilfs_ifile_unmap_inode(raw_inode); brelse(bh); |