C - malloc array in function and then access array from outside

Question

Here is how I malloc an int var and then access this var outside of the function

int f1(int ** b) {
  *b = malloc(sizeof(int)); 
  **b = 5;
}

int main() {
          


        

Answer 1

Instead of malloc()ing a single int, malloc the array.

int f1(int * b) {
  b = malloc(ARRAY_LENGTH * sizeof(int)); 
  *b = 5;
  b[1] = 6;
  *(b + 2) = 7;
}