udf: Detect system inodes linked into directory hierarchy

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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>

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Jan Kara 2023-01-03 10:03:35 +01:00

parent fc8033a34a

commit 85a37983ec

1 changed files with 6 additions and 1 deletions

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7

fs/udf/inode.c

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