You seem to have some apprehensions and that is why you have raised the query.
The legitimate owner (donor as in query) can dispose his estate/property whose title/ownership is vested in owner (donor), by a valid/registered deed.
If there is NO defect in title/ownership and estate/property is disposed by free will of owner then there should be NO issue.
Usually in case donor changes his/her mind then sometimes they cancel the gift deed (unilaterly) which may not have any legal force.
The gift deed can be cancelled by both donor and donee by appearing before the same registering authority.
Otherwise court alone can revoke the gift deed, on merits of matter e.g; if IT is established in court that gift was obtained by coercion, fraud, pressure etc…
What are reasons for your apprehensions?