Does freeing an uninitialized pointer result in undefined behavior?

Question

If you have a pointer that is not initialized and, by mistake, try to free it, is this going to result in undefined behavior?

Like:

int main(void){

             


        

Answer 1

Yes, it does, since you should only free() a pointer that 1. is NULL or 2. you obtained via a call to malloc(), calloc() or realloc().