diff options
| author | Jan Kara <jack@suse.cz> | 2023-01-03 10:03:35 +0100 |
|---|---|---|
| committer | Jan Kara <jack@suse.cz> | 2023-01-09 10:39:53 +0100 |
| commit | 85a37983ec69cc9fcd188bc37c4de15ee326355a (patch) | |
| tree | 65435e3e1f74585720820943721671505a43e478 | |
| parent | fc8033a34a3ca7d23353e645e6dde5d364ac5f12 (diff) | |
udf: Detect system inodes linked into directory hierarchy
When UDF filesystem is corrupted, hidden system inodes can be linked
into directory hierarchy which is an avenue for further serious
corruption of the filesystem and kernel confusion as noticed by syzbot
fuzzed images. Refuse to access system inodes linked into directory
hierarchy and vice versa.
CC: stable@vger.kernel.org
Reported-by: syzbot+38695a20b8addcbc1084@syzkaller.appspotmail.com
Signed-off-by: Jan Kara <jack@suse.cz>
| -rw-r--r-- | fs/udf/inode.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/fs/udf/inode.c b/fs/udf/inode.c index 9ee269d3d546..96873fa2f683 100644 --- a/fs/udf/inode.c +++ b/fs/udf/inode.c @@ -1813,8 +1813,13 @@ struct inode *__udf_iget(struct super_block *sb, struct kernel_lb_addr *ino, if (!inode) return ERR_PTR(-ENOMEM); - if (!(inode->i_state & I_NEW)) + if (!(inode->i_state & I_NEW)) { + if (UDF_I(inode)->i_hidden != hidden_inode) { + iput(inode); + return ERR_PTR(-EFSCORRUPTED); + } return inode; + } memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr)); err = udf_read_inode(inode, hidden_inode); |