udf: Check length of extended attributes and allocation descriptors

udf: Check length of extended attributes and allocation descriptors

commit 23b133bdc452aa441fcb9b82cbf6dd05cfd342d0 upstream.

Check length of extended attributes and allocation descriptors when
loading inodes from disk. Otherwise corrupted filesystems could confuse
the code and make the kernel oops.

Reported-by: Carl Henrik Lunde <chlunde@ping.uio.no>
Signed-off-by: Jan Kara <jack@suse.cz>
[lizf: Backported to 3.4:
 - call make_bad_inode() and then return
 - relace bs with inode->i_sb->s_blocksize]
Signed-off-by: Zefan Li <lizefan@huawei.com>