Re: [PATCH] PCI/MSI: Handle the NOMASK flag correctly for all PCI/MSI backends

[Jürgen Groß]

On 26.03.25 13:05, Thomas Gleixner wrote:
> The conversion of the XEN specific global variable pci_msi_ignore_mask to a
> MSI domain flag, missed the facts that:
>
>      1) Legacy architectures do not provide a interrupt domain
>      2) Parent MSI domains do not necessarily have a domain info attached
>     
> Both cases result in an unconditional NULL pointer dereference.
>
> Cure this by using the existing pci_msi_domain_supports() helper, which
> handles all possible cases correctly.
>
> Fixes: c3164d2e0d18 ("PCI/MSI: Convert pci_msi_ignore_mask to per MSI domain flag")
> Reported-by: Daniel Gomez <da.gomez@xxxxxxxxxx>
> Reported-by: Borislav Petkov <bp@xxxxxxxxx>
> Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> Tested-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
> Tested-by: Borislav Petkov <bp@xxxxxxxxx>
> Tested-by: Daniel Gomez <da.gomez@xxxxxxxxxx>

As the patch introducing the problem went in via the Xen tree, should
this fix go in via the Xen tree, too?


Juergen

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