What is the best way to free memory after returning from an error?

Question

Suppose I have a function that allocates memory for the caller:

int func(void **mem1, void **mem2) {
    *mem1 = malloc(SIZE);
    if (!*mem1) return 1;

            


        

Answer 1

This is a readable alternative:

int func(void **mem1, void **mem2) {
  *mem1 = malloc(SIZE);
  *mem2 = malloc(SIZE);
  if (!*mem1 || !*mem2) {
    free(*mem2);
    free(*mem1);
    return 1;
  }
  return 0;
}