Re: sched: fair: NULL ptr deref in check_preempt_wakeup

[Michael wang]

On 02/17/2014 05:20 PM, Peter Zijlstra wrote:
[snip]
>>  static void switched_to_fair(struct rq *rq, struct task_struct *p)
>>  {
>> -	if (!p->se.on_rq)
>> +	struct sched_entity *se = &p->se;
>> +#ifdef CONFIG_FAIR_GROUP_SCHED
>> +	se->depth = se->parent ? se->parent->depth + 1 : 0;
>> +#endif
>> +	if (!se->on_rq)
>>  		return;
>>  
>>  	/*
> 
> Yes indeed. My first idea yesterday was to put it in set_task_rq() to be
> absolutely sure we catch all; but if this is sufficient its better.

Agree, let's wait for Sasha's testing result then :)

Regards,
Michael Wang

> 
> Thanks!
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