Re: [RFC v1 3/4] vfio-ccw: Set pa_nr to 0 if memory allocation fails for pa_iova_pfn

[Farhan Ali <alifm@linux.ibm.com>]

On 07/02/2019 04:45 AM, Cornelia Huck wrote:
> On Mon,  1 Jul 2019 12:23:45 -0400
> Farhan Ali <alifm@linux.ibm.com> wrote:
> 
>> So we clean up correctly.
>>
>> Signed-off-by: Farhan Ali <alifm@linux.ibm.com>
>> ---
>>   drivers/s390/cio/vfio_ccw_cp.c | 4 +++-
>>   1 file changed, 3 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/s390/cio/vfio_ccw_cp.c b/drivers/s390/cio/vfio_ccw_cp.c
>> index cab1be9..c5655de 100644
>> --- a/drivers/s390/cio/vfio_ccw_cp.c
>> +++ b/drivers/s390/cio/vfio_ccw_cp.c
>> @@ -72,8 +72,10 @@ static int pfn_array_alloc(struct pfn_array *pa, u64 iova, unsigned int len)
>>   				  sizeof(*pa->pa_iova_pfn) +
>>   				  sizeof(*pa->pa_pfn),
>>   				  GFP_KERNEL);
>> -	if (unlikely(!pa->pa_iova_pfn))
>> +	if (unlikely(!pa->pa_iova_pfn)) {
>> +		pa->pa_nr = 0;
>>   		return -ENOMEM;
>> +	}
>>   	pa->pa_pfn = pa->pa_iova_pfn + pa->pa_nr;
>>   
>>   	pa->pa_iova_pfn[0] = pa->pa_iova >> PAGE_SHIFT;
> 
> This looks like an older error -- can you give a Fixes: tag? (Yeah, I
> know I sound like a broken record wrt that tag... :)
> 
Yes, this is an older error. And yup I will add a fixes tag :)