linux-kernel - Re: [PATCH] ACPI / PCI: Fix NULL pointer dereference in acpi_get_pci

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Message-Id: <200910060201.42519.rjw@sisk.pl>
Date:	Tue, 6 Oct 2009 02:01:42 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Alex Chiang <achiang@...com>
Cc:	Len Brown <lenb@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	Danny Feng <dfeng@...hat.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Linux PCI <linux-pci@...r.kernel.org>, chepioq@...il.com
Subject: Re: [PATCH] ACPI / PCI: Fix NULL pointer dereference in acpi_get_pci_dev()

On Tuesday 06 October 2009, Alex Chiang wrote:
> * Rafael J. Wysocki <rjw@...k.pl>:
> > 
> > Fixes http://bugzilla.kernel.org/show_bug.cgi?id=14129, which is a
> > regression from 2.6.30.
> 
> Thanks for doing this.
> 
> One small comment below (not major), but other than that:
> 
> Reviewed-by: Alex Chiang <achiang@...com>
> 
> > Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
> > Reported-by: Danny Feng <dfeng@...hat.com>
> > Tested-by: chepioq <chepioq@...il.com>
> > ---
> >  drivers/acpi/pci_root.c |   12 ++++++++++++
> >  1 file changed, 12 insertions(+)
> > 
> > Index: linux-2.6/drivers/acpi/pci_root.c
> > ===================================================================
> > --- linux-2.6.orig/drivers/acpi/pci_root.c
> > +++ linux-2.6/drivers/acpi/pci_root.c
> > @@ -389,6 +389,18 @@ struct pci_dev *acpi_get_pci_dev(acpi_ha
> >  
> >  		pbus = pdev->subordinate;
> >  		pci_dev_put(pdev);
> > +
> > +		/*
> > +		 * During resume from a sleep state we can get a dock
> > +		 * notification for a device that is present in ACPI tables,
> > +		 * but not physically accessible at the moment, so tell the
> > +		 * caller it's not present in that case.
> > +		 */
> > +		if (!pbus) {
> > +			dev_info(&pdev->dev, "Secondary bus not present\n");
> 
> Should this be dev_dbg() or maybe even strike it completely?

I thought about that, but I decided not to just in order to get some idea about
how many affected systems are out there.  If that happens to be a problem for
anyone, we can simply remove the message in the future.

> 
> > +			pdev = NULL;
> > +			break;
> > +		}
> >  	}
> >  out:
> >  	list_for_each_entry_safe(node, tmp, &device_list, node)
> > 

Thanks,
Rafael
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