udf: Fix error handling in udf_new_inode()

When memory allocation of iinfo or block allocation fails, already
allocated struct udf_inode_info gets freed with iput() and
udf_evict_inode() may look at inode fields which are not properly
initialized. Fix it by marking inode bad before dropping reference to it
in udf_new_inode().

Reported-by: syzbot+9ca499bb57a2b9e4c652@syzkaller.appspotmail.com
Signed-off-by: Jan Kara <jack@suse.cz>

fs/udf/ialloc.c

@@ -77,6 +77,7 @@ struct inode *udf_new_inode(struct inode *dir, umode_t mode)
 					GFP_KERNEL);
 	}
 	if (!iinfo->i_data) {
+		make_bad_inode(inode);
 		iput(inode);
 		return ERR_PTR(-ENOMEM);
 	}
@@ -86,6 +87,7 @@ struct inode *udf_new_inode(struct inode *dir, umode_t mode)
 			      dinfo->i_location.partitionReferenceNum,
 			      start, &err);
 	if (err) {
+		make_bad_inode(inode);
 		iput(inode);
 		return ERR_PTR(err);
 	}