Re: [PATCH v2 1/9] libata: fix ata_host_alloc_pinfo()

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On 2021/08/06 23:25, James Bottomley wrote:
> On Fri, 2021-08-06 at 16:42 +0900, Damien Le Moal wrote:
>> Avoid a potential NULL pointer dereference by testing that the ATA
>> port
>> info variable "pi".
>>
>> Reported-by: kernel test robot <lkp@xxxxxxxxx>
>> Signed-off-by: Damien Le Moal <damien.lemoal@xxxxxxx>
>> ---
>>  drivers/ata/libata-core.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
>> index 61c762961ca8..ea8b91297f12 100644
>> --- a/drivers/ata/libata-core.c
>> +++ b/drivers/ata/libata-core.c
>> @@ -5458,7 +5458,7 @@ struct ata_host *ata_host_alloc_pinfo(struct
>> device *dev,
>>  		ap->link.flags |= pi->link_flags;
>>  		ap->ops = pi->port_ops;
> 
> Hey, pi is used here
> 
>>  
>> -		if (!host->ops && (pi->port_ops !=
>> &ata_dummy_port_ops))
>> +		if (!host->ops && pi && pi->port_ops !=
>> &ata_dummy_port_ops)
> 
> So checking it here is just going to get us a load of static checker
> reports.

I got a load of static checker warnings already before sending this :)
And I got lost in that load obviously. Will check again.

> 
> James
> 
> 
> 


-- 
Damien Le Moal
Western Digital Research




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