linux-kernel - Re: [PATCH] intel-iommu: Fix use after release during device attach

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Date:	Sun, 14 Nov 2010 10:18:37 +0100
From:	Jan Kiszka <jan.kiszka@....de>
To:	Sheng Yang <sheng@...ux.intel.com>,
	David Woodhouse <dwmw2@...radead.org>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	kvm <kvm@...r.kernel.org>, Avi Kivity <avi@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	iommu@...ts.linux-foundation.org
Subject: Re: [PATCH] intel-iommu: Fix use after release during device attach

Am 02.11.2010 08:31, Sheng Yang wrote:
> On Tuesday 02 November 2010 15:05:51 Jan Kiszka wrote:
>> From: Jan Kiszka <jan.kiszka@...mens.com>
>>
>> Obtail the new pgd pointer before releasing the page containing this
>> value.
>>
>> Signed-off-by: Jan Kiszka <jan.kiszka@...mens.com>
>> ---
>>
>> Who is taking care of this? The kvm tree?
>>
>>  drivers/pci/intel-iommu.c |    2 +-
>>  1 files changed, 1 insertions(+), 1 deletions(-)
>>
>> diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
>> index 4789f8e..35463dd 100644
>> --- a/drivers/pci/intel-iommu.c
>> +++ b/drivers/pci/intel-iommu.c
>> @@ -3627,9 +3627,9 @@ static int intel_iommu_attach_device(struct
>> iommu_domain *domain,
>>
>>  		pte = dmar_domain->pgd;
>>  		if (dma_pte_present(pte)) {
>> -			free_pgtable_page(dmar_domain->pgd);
>>  			dmar_domain->pgd = (struct dma_pte *)
>>  				phys_to_virt(dma_pte_addr(pte));
>> +			free_pgtable_page(pte);
>>  		}
>>  		dmar_domain->agaw--;
>>  	}
> 
> Reviewed-by: Sheng Yang <sheng@...ux.intel.com>
> 
> CC iommu mailing list and David.

Ping...

I think this fix also qualifies for stable (.35 and .36).

Jan



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