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PCI: pciehp: Prevent NULL dereference during probe

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commit bceee4a97e upstream.

pciehp assumes that dev->subordinate, the struct pci_bus for a bridge's
secondary bus, exists.  But we do not create that 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 secondary bus is present.

Signed-off-by: Andreas Noever <andreas.noever@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Zefan Li <lizefan@huawei.com>
This commit is contained in:
Andreas Noever 2014-09-16 15:16:02 -06:00 committed by Zefan Li
parent c002aa006f
commit 7cf009d054
1 changed files with 7 additions and 0 deletions
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7
drivers/pci/hotplug/pciehp_core.c
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@ -237,6 +237,13 @@ static int pciehp_probe(struct pcie_device *dev)
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");