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

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Date:	Fri, 10 Dec 2010 10:44:02 -0800
From:	Chris Wright <chrisw@...s-sol.org>
To:	Jan Kiszka <jan.kiszka@...mens.com>
Cc:	Sheng Yang <sheng@...ux.intel.com>,
	David Woodhouse <dwmw2@...radead.org>,
	iommu@...ts.linux-foundation.org,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	kvm <kvm@...r.kernel.org>, Avi Kivity <avi@...hat.com>
Subject: Re: [PATCH] intel-iommu: Fix use after release during device attach

* Jan Kiszka (jan.kiszka@...mens.com) wrote:
> >>> --- 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));

While here, might as well remove the unnecessary cast.

> >>> +			free_pgtable_page(pte);
> >>>  		}
> >>>  		dmar_domain->agaw--;
> >>>  	}
> >>
> >> Reviewed-by: Sheng Yang <sheng@...ux.intel.com>

Acked-by: Chris Wright <chrisw@...s-sol.org>

> >> CC iommu mailing list and David.
> > 
> > Ping...
> > 
> > I think this fix also qualifies for stable (.35 and .36).
> > 
> 
> Still not merged?

David, do you plan to pick this one up?

thanks,
-chris
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