From 486edb24952c930966dad125f6727017353e9361 Mon Sep 17 00:00:00 2001 From: Boris Ostrovsky Date: Mon, 4 Aug 2014 18:17:23 -0400 Subject: [PATCH] xen/pci: Allocate memory for physdev_pci_device_add's optarr physdev_pci_device_add's optarr[] is a zero-sized array and therefore reference to add.optarr[0] is accessing memory that does not belong to the 'add' variable. Signed-off-by: Boris Ostrovsky Reviewed-by: Jan Beulich Signed-off-by: David Vrabel --- drivers/xen/pci.c | 27 ++++++++++++++++----------- 1 file changed, 16 insertions(+), 11 deletions(-) diff --git a/drivers/xen/pci.c b/drivers/xen/pci.c index dd9c249ea311..95ee4302ffb8 100644 --- a/drivers/xen/pci.c +++ b/drivers/xen/pci.c @@ -41,24 +41,29 @@ static int xen_add_device(struct device *dev) #endif if (pci_seg_supported) { - struct physdev_pci_device_add add = { - .seg = pci_domain_nr(pci_dev->bus), - .bus = pci_dev->bus->number, - .devfn = pci_dev->devfn + struct { + struct physdev_pci_device_add add; + uint32_t pxm; + } add_ext = { + .add.seg = pci_domain_nr(pci_dev->bus), + .add.bus = pci_dev->bus->number, + .add.devfn = pci_dev->devfn }; + struct physdev_pci_device_add *add = &add_ext.add; + #ifdef CONFIG_ACPI acpi_handle handle; #endif #ifdef CONFIG_PCI_IOV if (pci_dev->is_virtfn) { - add.flags = XEN_PCI_DEV_VIRTFN; - add.physfn.bus = physfn->bus->number; - add.physfn.devfn = physfn->devfn; + add->flags = XEN_PCI_DEV_VIRTFN; + add->physfn.bus = physfn->bus->number; + add->physfn.devfn = physfn->devfn; } else #endif if (pci_ari_enabled(pci_dev->bus) && PCI_SLOT(pci_dev->devfn)) - add.flags = XEN_PCI_DEV_EXTFN; + add->flags = XEN_PCI_DEV_EXTFN; #ifdef CONFIG_ACPI handle = ACPI_HANDLE(&pci_dev->dev); @@ -77,8 +82,8 @@ static int xen_add_device(struct device *dev) status = acpi_evaluate_integer(handle, "_PXM", NULL, &pxm); if (ACPI_SUCCESS(status)) { - add.optarr[0] = pxm; - add.flags |= XEN_PCI_DEV_PXM; + add->optarr[0] = pxm; + add->flags |= XEN_PCI_DEV_PXM; break; } status = acpi_get_parent(handle, &handle); @@ -86,7 +91,7 @@ static int xen_add_device(struct device *dev) } #endif /* CONFIG_ACPI */ - r = HYPERVISOR_physdev_op(PHYSDEVOP_pci_device_add, &add); + r = HYPERVISOR_physdev_op(PHYSDEVOP_pci_device_add, add); if (r != -ENOSYS) return r; pci_seg_supported = false; -- 2.20.1