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authorJiri Slaby <jslaby@suse.cz>2010-06-09 22:31:13 +0200
committerJesse Barnes <jbarnes@virtuousgeek.org>2010-06-11 13:10:21 -0700
commita7ef7d1f5e898984c479e8c41ca702141bbadc78 (patch)
treefa742fbb39071799d02652cf5cbbca3f25af5724 /drivers/pci
parent3be434f0244ee059432f92de7e891ee514f41738 (diff)
PCI: hotplug/cpqphp, fix NULL dereference
There are devices out there which are PCI Hot-plug controllers with compaq PCI IDs, but are not bridges, hence have pdev->subordinate NULL. But cpqphp expects the pointer to be non-NULL. Add a check to the probe function to avoid oopses like: BUG: unable to handle kernel NULL pointer dereference at 00000050 IP: [<f82e3c41>] cpqhpc_probe+0x951/0x1120 [cpqphp] *pdpt = 0000000033779001 *pde = 0000000000000000 ... The device here was: 00:0b.0 PCI Hot-plug controller [0804]: Compaq Computer Corporation PCI Hotplug Controller [0e11:a0f7] (rev 11) Subsystem: Compaq Computer Corporation Device [0e11:a2f8] Signed-off-by: Jiri Slaby <jslaby@suse.cz> Cc: Greg KH <greg@kroah.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'drivers/pci')
-rw-r--r--drivers/pci/hotplug/cpqphp_core.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/pci/hotplug/cpqphp_core.c b/drivers/pci/hotplug/cpqphp_core.c
index b3e5580c837b..4952c3b9379d 100644
--- a/drivers/pci/hotplug/cpqphp_core.c
+++ b/drivers/pci/hotplug/cpqphp_core.c
@@ -828,7 +828,14 @@ static int cpqhpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
pci_name(pdev), err);
return err;
}
+
bus = pdev->subordinate;
+ if (!bus) {
+ dev_notice(&pdev->dev, "the device is not a bridge, "
+ "skipping\n");
+ rc = -ENODEV;
+ goto err_disable_device;
+ }
/* Need to read VID early b/c it's used to differentiate CPQ and INTC
* discovery