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Re: [PATCH] PCI/MSI: Handle the NOMASK flag correctly for all PCI/MSI backends
- To: Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Daniel Gomez <da.gomez@xxxxxxxxxx>
- From: Juergen Gross <jgross@xxxxxxxx>
- Date: Wed, 26 Mar 2025 13:16:07 +0100
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- Cc: Bjorn Helgaas <helgaas@xxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, linux-pci@xxxxxxxxxxxxxxx, Bjorn Helgaas <bhelgaas@xxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, x86@xxxxxxxxxx, "H. Peter Anvin" <hpa@xxxxxxxxx>
- Delivery-date: Wed, 26 Mar 2025 12:16:20 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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>
Reviewed-by: Juergen Gross <jgross@xxxxxxxx>
Juergen
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