PCI: Don't oops on virtual buses in acpi_pci_get_bridge_handle()

acpi_pci_get_bridge_handle() returns the ACPI handle for the bridge device
(either a host bridge or a PCI-to-PCI bridge) leading to a PCI bus.  But
SR-IOV virtual functions can be on a virtual bus with no bridge leading to
it.  Return a NULL acpi_handle in this case instead of trying to
dereference the NULL pointer to the bridge.

This fixes a NULL pointer dereference oops in pci_get_hp_params() when
adding SR-IOV VF devices on virtual buses.

[bhelgaas: changelog, add comment in code]
Fixes: 6cd33649fa83 ("PCI: Add pci_configure_device() during enumeration")
Link: https://bugzilla.kernel.org/show_bug.cgi?id=87591
Reported-by: Chao Zhou <chao.zhou@intel.com>
Reported-by: Joerg Roedel <joro@8bytes.org>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

diff --git a/include/linux/pci-acpi.h b/include/linux/pci-acpi.h
index 64dacb7288a6fc79e86ca536753f342a37252949..24c7728ca681f997a3a5b10f78ec7af13fd558d3 100644 (file)
--- a/include/linux/pci-acpi.h
+++ b/include/linux/pci-acpi.h
@@ -41,8 +41,13 @@ static inline acpi_handle acpi_pci_get_bridge_handle(struct pci_bus *pbus)
 
        if (pci_is_root_bus(pbus))
                dev = pbus->bridge;
-       else
+       else {
+               /* If pbus is a virtual bus, there is no bridge to it */
+               if (!pbus->self)
+                       return NULL;
+
                dev = &pbus->self->dev;
+       }
 
        return ACPI_HANDLE(dev);
 }