关于释放指针导致的程序崩溃 ？ 好像是野指针的问题？

释放特定的指针并进行合并
int memory_merge(int pid,NODE node)
{
int num = node->total;//这里会出错
int temp1,temp2;

if(node->left==NULL&&node->right==NULL)
{

 if(node->pid==pid)
 {
     inital(node,num);
     return -2;
 }
 else
     return -1;

}

temp1 = memory_merge(pid,node->left);
if(temp1==-2)
{

  if(node->right->remain_max!=num/2)
    node->remain_max = node->left->total;
  else if(node->left->flag==0)
  {
    free(node->left);
    free(node->right);
    inital(node,num);
  }
  return -2;

}
else
{

  temp2 = memory_merge(pid,node->right);
  if(temp2==-1)
    return -1;
  else
  {
     if(node->left->remain_max!=num/2)
       node->remain_max = node->right->total;
     else if(node->right->flag==0)
     {
      free(node->left);
      free(node->right);
      inital(node,num);
     }
     return -2;
  }

}
}