ext4: disallow ea_inodes with extended attributes

ext4: disallow ea_inodes with extended attributes

commit 2bc7e7c1a3bc9bd0cbf0f71006f6fe7ef24a00c2 upstream.

An ea_inode stores the value of an extended attribute; it can not have
extended attributes itself, or this will cause recursive nightmares.
Add a check in ext4_iget() to make sure this is the case.

Cc: stable@kernel.org
Reported-by: syzbot+e44749b6ba4d0434cd47@syzkaller.appspotmail.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Link: https://lore.kernel.org/r/20230524034951.779531-4-tytso@mit.edu
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>