linux-kernel - Re: [Question] null pointer risk of kernel workqueue

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Message-ID: <d5821887-343a-1f56-08da-372e02546905@huawei.com>
Date:   Tue, 24 Oct 2017 08:33:31 +0800
From:   Li Bin <huawei.libin@...wei.com>
To:     Tejun Heo <tj@...nel.org>
CC:     tanxiaofei <tanxiaofei@...wei.com>, <jiangshanlai@...il.com>,
        <linux-kernel@...r.kernel.org>, John Garry <john.garry@...wei.com>
Subject: Re: [Question] null pointer risk of kernel workqueue



on 2017/10/23 22:03, Tejun Heo wrote:
>>
>> And I think the following patch can solve the bug, right?
>>
>> diff --git a/kernel/workqueue_internal.h b/kernel/workqueue_internal.h
>> index 8635417..650680c 100644
>> --- a/kernel/workqueue_internal.h
>> +++ b/kernel/workqueue_internal.h
>> @@ -59,7 +59,7 @@ struct worker {
>>   */
>>  static inline struct worker *current_wq_worker(void)
>>  {
>> -       if (current->flags & PF_WQ_WORKER)
>> +       if (!in_irq() && (current->flags & PF_WQ_WORKER))
>>                 return kthread_data(current);
>>         return NULL;
>>  }
> 
> Yeah, that makes sense to me.  Can you please resend the patch with
> patch description and SOB?

Ok, I will resend the patch soon.

Thanks,
Li Bin

> 
> Thanks.
>