strdup and memory leaking

Does strdup allocate another memory zone and create another pointer every time?

For example: does the following code result in a memory leak?

void x(char** d, char* s){
    *d = strdup(s);
}

int main(){
    char* test = NULL;
    x(&test, "abcd");
    x(&test, "etc");
    return 0;
}