On Fri, 2009-07-31 at 00:55 +0800, Thomas Meyer wrote:
> Am Montag, den 27.07.2009, 17:03 +0800 schrieb Lin Ming:
> > Hi, Thomas
> >
> > Would you please try below patch?
>
> Yes. The patch below makes the NULL pointer dereference go away. Is the
> hardware_id.string accessibly thru sysfs?
It's shown thru sysfs if it's not NULL.
See acpi_device_setup_files.
static int acpi_device_setup_files(struct acpi_device *dev)
{
....
if (dev->flags.hardware_id) {
result = device_create_file(&dev->dev, &dev_attr_hid);
if (result)
goto end;
}
....
}
Lin Ming
>
> >
> > info->hardware_id.string[sizeof(info->hardware_id.length) - 1] = '\0' is
> > not needed anymore because acpi_get_object_info already handles it.
> >
> > /* Allocate a buffer for the HID */
> >
> > hid =
> > ACPI_ALLOCATE_ZEROED(sizeof(struct acpica_device_id) +
> > (acpi_size) length);
> >
> > And it would cause null pointer deference if info->hardware_id.string is
> > NULL.
> >
> > So delete it.
> >
> > diff --git a/drivers/pci/hotplug/acpiphp_ibm.c b/drivers/pci/hotplug/acpiphp_ibm.c
> > index a9d926b..e7be66d 100644
> > --- a/drivers/pci/hotplug/acpiphp_ibm.c
> > +++ b/drivers/pci/hotplug/acpiphp_ibm.c
> > @@ -406,7 +406,6 @@ static acpi_status __init ibm_find_acpi_device(acpi_handle handle,
> > __func__, status);
> > return retval;
> > }
> > - info->hardware_id.string[sizeof(info->hardware_id.length) - 1] = '\0';
> >
> > if (info->current_status && (info->valid & ACPI_VALID_HID) &&
> > (!strcmp(info->hardware_id.string, IBM_HARDWARE_ID1) ||
> >
> >
> > On Mon, 2009-07-27 at 13:09 +0800, Moore, Robert wrote:
> > > Lin Ming,
> > >
> > > Can you take a look at this?
> > >
> > > Thanks
> > > Bob
> > >
> > >
> > > -----Original Message-----
> > > From: Thomas Meyer [mailto:thomas@xxxxxxxx]
> > > Sent: Sunday, July 26, 2009 3:15 AM
> > > To: Moore, Robert; Brown, Len; linux-next@xxxxxxxxxxxxxxx
> > > Subject: next-20090724: null pointer dereference from ibm_find_acpi_device
> > >
> > > Hi.
> > >
> > > Probably caused by commit fbe8cddd2d85979d273d7937a2b8a47498694d91.
> > >
> > > See attached screenshot.
> > >
> >
>
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