This is a note to let you know that I've just added the patch titled
PCI: pciehp: Prevent NULL dereference during probe
to the 3.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
pci-pciehp-prevent-null-dereference-during-probe.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From bceee4a97eb58bd0e80e39eff11b506ddd9e7ad3 Mon Sep 17 00:00:00 2001
From: Andreas Noever <andreas.noever@xxxxxxxxx>
Date: Tue, 16 Sep 2014 15:16:02 -0600
Subject: PCI: pciehp: Prevent NULL dereference during probe
From: Andreas Noever <andreas.noever@xxxxxxxxx>
commit bceee4a97eb58bd0e80e39eff11b506ddd9e7ad3 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@xxxxxxxxx>
Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/pci/hotplug/pciehp_core.c | 7 +++++++
1 file changed, 7 insertions(+)
--- a/drivers/pci/hotplug/pciehp_core.c
+++ b/drivers/pci/hotplug/pciehp_core.c
@@ -254,6 +254,13 @@ static int pciehp_probe(struct pcie_devi
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");
Patches currently in stable-queue which might be from andreas.noever@xxxxxxxxx are
queue-3.14/pci-pciehp-prevent-null-dereference-during-probe.patch
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