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authorShyam Iyer <shyam.iyer.t@gmail.com>2011-09-08 16:41:17 -0500
committerLinus Torvalds <torvalds@linux-foundation.org>2011-09-09 19:49:58 -0700
commit5307f6d5fb12fd01f9f321bc4a8fd77e74858647 (patch)
treefa0087ac08c4a914e8c3456741d57ddf27534b9a /drivers/pci
parenta6a5ed0dd36b4977789e888170f96840cc8b4501 (diff)
downloadlinux-5307f6d5fb12fd01f9f321bc4a8fd77e74858647.tar.bz2
Fix pointer dereference before call to pcie_bus_configure_settings
Commit b03e7495a862 ("PCI: Set PCI-E Max Payload Size on fabric") introduced a potential NULL pointer dereference in calls to pcie_bus_configure_settings due to attempts to access pci_bus self variables when the self pointer is NULL. To correct this, verify that the self pointer in pci_bus is non-NULL before dereferencing it. Reported-by: Stanislaw Gruszka <sgruszka@redhat.com> Signed-off-by: Shyam Iyer <shyam_iyer@dell.com> Signed-off-by: Jon Mason <mason@myri.com> Acked-by: Jesse Barnes <jbarnes@virtuousgeek.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/pci')
-rw-r--r--drivers/pci/hotplug/pcihp_slot.c4
-rw-r--r--drivers/pci/probe.c3
2 files changed, 3 insertions, 4 deletions
diff --git a/drivers/pci/hotplug/pcihp_slot.c b/drivers/pci/hotplug/pcihp_slot.c
index 753b21aaea61..3ffd9c1acc0a 100644
--- a/drivers/pci/hotplug/pcihp_slot.c
+++ b/drivers/pci/hotplug/pcihp_slot.c
@@ -169,7 +169,9 @@ void pci_configure_slot(struct pci_dev *dev)
(dev->class >> 8) == PCI_CLASS_BRIDGE_PCI)))
return;
- pcie_bus_configure_settings(dev->bus, dev->bus->self->pcie_mpss);
+ if (dev->bus && dev->bus->self)
+ pcie_bus_configure_settings(dev->bus,
+ dev->bus->self->pcie_mpss);
memset(&hpp, 0, sizeof(hpp));
ret = pci_get_hp_params(dev, &hpp);
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 8473727b29fa..0820fc1544e8 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -1456,9 +1456,6 @@ void pcie_bus_configure_settings(struct pci_bus *bus, u8 mpss)
{
u8 smpss = mpss;
- if (!bus->self)
- return;
-
if (!pci_is_pcie(bus->self))
return;