I think the original question was intended as: if you give someone at depth air from your mouth, will their lungs pop as they ascend. If this was the meaning, then the answer is (tadaa!): maybe. It is certainly possible, but more likely scenario is that the diver will let the air out. That happens even with constant weight with heavy packing, many divers cannot keep the air in their lungs at the last few meters and it sort of bursts out. Unless you're laryngospasming or conciously force the air to stay in, it will most likely come out.
Scuba divers are always scared sensless with the story of "the boy who did not breathe on ascent". It's a valid consern, but I doubt a lung rupture would occur in every case. More likely is that the epiglottis/larynx/whatever would just give in and let the air out. Of course it may happen and so it should be avoided, and being in panic is of course a totally different story.
If by CPR he meant artificial respiration of an unconcious diver, then the question is just absurd. Like everyone's said, get him to the surface and then think about CPR. If he's laryngospasming you would not get any air in there anyway. If he's already past that, then you're pretty much too late anyway
