返回指向结构的指针后出现分段错误

struct ion_bin
{
    int freq;
    long height;
    int amplitude;
};

//Dynamic auto allocating array
typedef struct {
  struct ion_bin *array;
  size_t used;
  size_t size;
} Ionogram;

void freeArray(Ionogram *a); //free memory
void insertArray(Ionogram *a,struct ion_bin element); //realloc memory
void initArray(Ionogram *a,size_t initialSize); //malloc memory

Ionogram* read(int argn,char* argv[])
{
    FILE* stream;
    Ionogram ionogramObj;

    //fill ionogram from file by initArray and insertArray  
    //.....

    return &ionogramObj;
}

int main(int argn,char* argv[])
{
    Ionogram* r = read(argn,argv);

    fprintf(stderr,"Array size: %d Used %dn",r->size,r->used); //SEGMENTATION FAULT ERROR
    //int second = (*(r->array + 2)).amplitude; //YET SEGMENTATION FAULT ERROR TOO

    //fprintf(stderr,"%d",second);
    return 0;
}

这个程序编译成功,但在运行时和调试通过尝试获取返回结构的字段(在main方法中)触发分段错误错误(SIGSEGV)如何修复此错误？