linux-kernel - Re: [PATCH] PCI/MSI: Fix MSI IRQ domains for SR-IOV

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Date:	Thu, 24 Sep 2015 11:59:20 -0500
From:	Bjorn Helgaas <helgaas@...nel.org>
To:	Alex Williamson <alex.williamson@...hat.com>
Cc:	linux-pci@...r.kernel.org, marc.zyngier@....com,
	tglx@...utronix.de, linux-kernel@...r.kernel.org,
	Joerg Roedel <joro@...tes.org>
Subject: Re: [PATCH] PCI/MSI: Fix MSI IRQ domains for SR-IOV

[+cc Joerg]

On Fri, Sep 18, 2015 at 03:08:54PM -0600, Alex Williamson wrote:
> SR-IOV creates a virtual bus where bus->self is NULL.  This results
> in a segfault as VFs are added and we scan for an MSI domain without
> taking that into account.  Detect this and scan up to the parent bus
> until we find a real bridge.
> 
> Fixes: 44aa0c657e3e ("PCI/MSI: Add hooks to populate the msi_domain field")
> Signed-off-by: Alex Williamson <alex.williamson@...hat.com>

Applied to for-linus with changelog below for v4.3, thanks!

    PCI/MSI: Fix MSI IRQ domains for VFs on virtual buses
    
    SR-IOV creates a virtual bus where bus->self is NULL.  When we add VFs and
    scan for an MSI domain, pci_set_bus_msi_domain() dereferences bus->self,
    which causes a kernel NULL pointer dereference oops.
    
    Scan up to the parent bus until we find a real bridge where we can get the
    MSI domain.
    
    [bhelgaas: changelog]
    Fixes: 44aa0c657e3e ("PCI/MSI: Add hooks to populate the msi_domain field")
    Tested-by: Joerg Roedel <joro@...tes.org>
    Signed-off-by: Alex Williamson <alex.williamson@...hat.com>
    Signed-off-by: Bjorn Helgaas <helgaas@...nel.org>
    Acked-by: Marc Zyngier <marc.zyngier@....com>
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