CVE-2025-40076

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> PCI: rcar-host: Pass proper IRQ domain to generic_handle_domain_irq()<br /> <br /> Starting with commit dd26c1a23fd5 ("PCI: rcar-host: Switch to<br /> msi_create_parent_irq_domain()"), the MSI parent IRQ domain is NULL because<br /> the object of type struct irq_domain_info passed to:<br /> <br /> msi_create_parent_irq_domain() -&gt;<br /> irq_domain_instantiate()() -&gt;<br /> __irq_domain_instantiate()<br /> <br /> has no reference to the parent IRQ domain. Using msi-&gt;domain-&gt;parent as an<br /> argument for generic_handle_domain_irq() leads to below error:<br /> <br /> "Unable to handle kernel NULL pointer dereference at virtual address"<br /> <br /> This error was identified while switching the upcoming RZ/G3S PCIe host<br /> controller driver to msi_create_parent_irq_domain() (which was using a<br /> similar pattern to handle MSIs (see link section)), but it was not tested<br /> on hardware using the pcie-rcar-host controller driver due to lack of<br /> hardware.<br /> <br /> [mani: reworded subject and description]