Memory allocated with alloca gets freed at end of function or at end of scope?

Question

If I have a function like this:

void bla(int size) {
    while(b){
        char tmp[size];
        ......
    }
}

tmp gets freed at each it

Answer 1

alloca allocates on the stack and has no knowledge about scopes, so it gets freed after leaving the stack frame (= after leaving the function).