CVE-2024-26738 powerpc/pseries/iommu: DLPAR add doesn't completely initialize pci_controller

In the Linux kernel, the following vulnerability has been resolved: powerpc/pseries/iommu: DLPAR add doesn't completely initialize pcicontroller When a PCI device is dynamically added, the kernel oopses with a NULL pointer dereference: BUG: Kernel NULL pointer dereference on read at 0x00000030...