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Date: Tue, 16 Sep 2014 15:20:48 -0600 From: Bjorn Helgaas <bhelgaas@...gle.com> To: Andreas Noever <andreas.noever@...il.com> Cc: linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org Subject: Re: [PATCH] PCI: Prevent NULL dereference during pciehp probe On Mon, Jun 09, 2014 at 11:03:32PM +0200, Andreas Noever wrote: > 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@...il.com> Applied to pci/hotplug for v3.18, thanks! > --- > drivers/pci/hotplug/pciehp_core.c | 7 +++++++ > 1 file changed, 7 insertions(+) > > diff --git a/drivers/pci/hotplug/pciehp_core.c b/drivers/pci/hotplug/pciehp_core.c > index 0e0a2ff..e5abcaf 100644 > --- a/drivers/pci/hotplug/pciehp_core.c > +++ b/drivers/pci/hotplug/pciehp_core.c > @@ -255,6 +255,13 @@ 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"); > -- > 2.0.0 > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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