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| author | Jiri Slaby <jslaby@suse.cz> | 2010-06-09 22:31:13 +0200 |
|---|---|---|
| committer | Jesse Barnes <jbarnes@virtuousgeek.org> | 2010-06-11 13:10:21 -0700 |
| commit | a7ef7d1f5e898984c479e8c41ca702141bbadc78 (patch) | |
| tree | fa742fbb39071799d02652cf5cbbca3f25af5724 /drivers | |
| parent | 3be434f0244ee059432f92de7e891ee514f41738 (diff) | |
| download | lwn-a7ef7d1f5e898984c479e8c41ca702141bbadc78.tar.gz lwn-a7ef7d1f5e898984c479e8c41ca702141bbadc78.zip | |
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')
| -rw-r--r-- | drivers/pci/hotplug/cpqphp_core.c | 7 |
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 |