Well.. this could be dangerous, but it depends on where you live and where you want to distribute your software. I.e. in germany you can't just make a blanket disclaimer of liability, in germany you are always reliable for certain events, therefore a blanket disclaimer could make your license (partly) effectless, when it just has one invalid clause.
Just put a copyright notice, and mark it as freeware with the standard disclaimer of liability.
Therefore ask a lawyer.