typedef struct {
    uint8_t title_num;
    DRAW_PARA *title;
    uint8_t content_num;
    DRAW_PARA *content;
}PAGE_DATA;

typedef struct page_config{

    uint8_t page_n;
    PAGE_DATA *temp;
    char (*pdata)[40];
    struct page_config *pnext;
    struct page_config *pprev;

}PAGE_CONFIG;


PAGE_CONFIG* initLine(PAGE_CONFIG * head){
  
    head=(PAGE_CONFIG*)malloc(sizeof(PAGE_CONFIG));
 
    head->pprev=NULL;
    head->pnext=NULL;

    PAGE_CONFIG * list=head;
   
    for (int i=0; i<5; i++) {
        
        PAGE_CONFIG * body=(PAGE_CONFIG*)malloc(sizeof(PAGE_CONFIG));
        body->pprev=NULL;
        body->pnext=NULL;
        body->temp = &page_data[i];
        body->page_n = i;
        body->pdata = NULL;
        
        list->pnext=body;
        body->pprev=list;
      
        list=list->pnext;
    }
    return head;
}

PAGE_CONFIG* InsertTailNode(PAGE_CONFIG * head){
   
   
    PAGE_CONFIG *tmp = head;
    if(head == NULL)return 0;
        
    while((tmp->pnext) !=NULL)
    {
        tmp = tmp->pnext;
        nnn++;
    }
   
    PAGE_CONFIG *tailnode = (PAGE_CONFIG*)malloc(sizeof(PAGE_CONFIG));
    if(tailnode == NULL)return 0;
   
   
        tailnode->pdata = NULL;
        tailnode->temp = NULL;
        tailnode->page_n = nnn+1;
    tmp->pnext = tailnode;
    tailnode->pprev = tmp;
    tailnode->pnext = NULL;
   
    return head;
}


    Head = initLine(Head);
    current = Head->pnext;.
程序运行到InsertTailNode 函数内的    while((tmp->pnext) !=NULL) 就飞了， 应该是InsertTailNode 函数写的有些问题，求大神分析下

谢谢各位，代码我在网上抄的，是比较奇怪