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udf: Detect system inodes linked into directory hierarchy

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[ Upstream commit 85a37983ec ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jan Kara 2023-01-03 10:03:35 +01:00 committed by Greg Kroah-Hartman
parent ec852375bb
commit 1dc71eeb19
1 changed files with 6 additions and 1 deletions
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7
fs/udf/inode.c
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@ -1871,8 +1871,13 @@ 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);