PCI: Prevent NULL dereference during pciehp probe
pciehp assumes that dev->subordinate exists. But we do not assign a bus if
we run out of bus numbers during enumeration. This leads to a NULL
dereference in init_slot() (and other places).
Change pciehp_probe() to return -ENODEV when no subordinate bus is present.
Signed-off-by: Andreas Noever <andreas.noever@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
diff --git a/drivers/pci/hotplug/pciehp_core.c b/drivers/pci/hotplug/pciehp_core.c
index a2297db..07aa722 100644
--- a/drivers/pci/hotplug/pciehp_core.c
+++ b/drivers/pci/hotplug/pciehp_core.c
@@ -255,6 +255,13 @@
else if (pciehp_acpi_slot_detection_check(dev->port))
goto err_out_none;
+ if (!dev->port->subordinate) {
+ /* Can happen if we run out of bus numbers during probe */
+ dev_err(&dev->device,
+ "Hotplug bridge without secondary bus, ignoring\n");
+ goto err_out_none;
+ }
+
ctrl = pcie_init(dev);
if (!ctrl) {
dev_err(&dev->device, "Controller initialization failed\n");