自己写的一个程序 无法正确插入节点  帮忙看看什么问题呢

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#define NUM 4

typedef struct student
{
    char name[10];
    int  num;
    struct student *prev;
    struct student *next;
}NODE, *PNODE;

struct student *creatInode(struct student *pHead);
void removeInode(struct student *pHead);
void InsertInode(PNODE pHead, NODE *Inode);
void traverse_list(PNODE pHead);
struct student *pHead = NULL;

int main(void)
{

    //PNODE insert = NULL;
    int i = NUM-1;
    NODE a[NUM] = {{"zhang", 1}, {"li", 3}, {"wu", 2}, {"xu", 4}};
     PNODE studentInfo =(PNODE)malloc(sizeof(NODE));

    pHead = creatInode(studentInfo);
    for (; i>=0; i--)
    {
        InsertInode(pHead, &a[i]);
    }
    traverse_list(pHead);
    removeInode(pHead);
    traverse_list(pHead);
    return 0;
}

PNODE creatInode(PNODE pHead)
{
    PNODE pTail;
    pHead = (PNODE)malloc(sizeof(NODE));
    if (pHead == NULL)
    {
        printf("动态内存分配失败，程序中止！\n");
        exit(-1);
    }
    pTail = pHead;
    pTail->next = NULL;
    return pHead;
}

void InsertInode(PNODE pHead, PNODE Inode)
{
    if (!(Inode = (PNODE)malloc(sizeof(NODE))))
    {
        printf("malloc error");
        exit -1;
    }
    if(pHead->next != NULL)
    {
        pHead->next->prev = Inode;
        Inode->next = pHead->next;
        pHead->next = Inode;
        Inode->prev = pHead;
    }
    else
    {
                Inode->next = pHead->next;
                pHead->next = Inode;
                Inode->prev = pHead;
    }
}

void removeInode(NODE *pHead)
{
    int i = 0;
    int j = i+1;
    pHead = (PNODE)malloc(sizeof(NODE));
    for(; i<NUM; i++)
    {
        for(; j<NUM; j++)
        {
            if (pHead[i].num > pHead[j].num)
            {
                pHead = &pHead[i];
                pHead[i].next = pHead[j].next;
                pHead[i].prev = &pHead[j];
                pHead[j].prev = pHead->prev;
                pHead[j].next = &pHead[i];
            }
        }
    }
}

void traverse_list(PNODE pHead)
{
    PNODE p;
    p = pHead->next;
    if (NULL == p)
    {
       printf("链表为空！\n");
    }
    while(NULL != p)
    {
        printf("name :%s  num :%d \n",p->name,p->num);
        p = p->next;
    }
}

谢谢 原来是多分配了 一段内存