将其他对象指向的指针设置为null

Question

我有一个接受结构（指针）的函数。在此函数中，我遍历全局结构的队列的末尾，并将新结构添加到队列的末尾。完成此操作后，出于错误检查的目的，我需要将传入的结构（指针）设置为等于null而不影响全局队列。但是，当我将传入的结构设置为NULL时，会导致队列出现段错误。

编辑：我无法发布完整的代码，因为它对类敏感，但是我可以发布示例。

示例：

//There is code above this parsing the passedInJob in various ways, adding it to the queue if the final step
//This block of code just adds to queue, after this all references to the newly added job cause a segfault
//get the current head of the queue and put it in currJob
struct job * currJob = queue->head;

//Move to the end of the queue
while(currJob->nextJob != NULL)
   //move to the next job, when we hit NULL we're at the end
   currJob = currJob->nextJob

//Set the end of the queue to be the passed in job
currJob->next_job = passedInJob;

//We set passedInJob = NULL because at the end we check if the job still exists to signify there was an error adding the job
//This is causing the error, I believe setting this to NULL is setting the struct in the queue to NULL
passedInJob = NULL;

//Since there is code parsing above, we use this to ensure the job was added
if(passedInJob)
  //handle error