linux-kernel - Re: [RFC v2 2/8] iommu/iova: fix __alloc_and_insert_iova_range

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Date:   Thu, 10 Nov 2016 16:41:59 +0100
From:   Auger Eric <eric.auger@...hat.com>
To:     Joerg Roedel <joro@...tes.org>
Cc:     drjones@...hat.com, jason@...edaemon.net, kvm@...r.kernel.org,
        marc.zyngier@....com, punit.agrawal@....com, will.deacon@....com,
        linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org,
        diana.craciun@....com, alex.williamson@...hat.com,
        pranav.sawargaonkar@...il.com,
        linux-arm-kernel@...ts.infradead.org, tglx@...utronix.de,
        robin.murphy@....com, christoffer.dall@...aro.org,
        eric.auger.pro@...il.com
Subject: Re: [RFC v2 2/8] iommu/iova: fix __alloc_and_insert_iova_range

Hi Joerg,

On 10/11/2016 16:22, Joerg Roedel wrote:
> On Fri, Nov 04, 2016 at 11:24:00AM +0000, Eric Auger wrote:
>> Fix the size check within start_pfn and limit_pfn.
>>
>> Signed-off-by: Eric Auger <eric.auger@...hat.com>
>>
>> ---
>>
>> the issue was observed when playing with 1 page iova domain with
>> higher iova reserved.
>> ---
>>  drivers/iommu/iova.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/iommu/iova.c b/drivers/iommu/iova.c
>> index e23001b..ee29dbf 100644
>> --- a/drivers/iommu/iova.c
>> +++ b/drivers/iommu/iova.c
>> @@ -147,7 +147,7 @@ static int __alloc_and_insert_iova_range(struct iova_domain *iovad,
>>  	if (!curr) {
>>  		if (size_aligned)
>>  			pad_size = iova_get_pad_size(size, limit_pfn);
>> -		if ((iovad->start_pfn + size + pad_size) > limit_pfn) {
>> +		if ((iovad->start_pfn + size + pad_size - 1) > limit_pfn) {
> 
> A >= check is more readable here.

Sure

Thanks

Eric
> 
> 
> 	Joerg
> 
> 
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> linux-arm-kernel@...ts.infradead.org
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> 

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