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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20091005233759.GB14394@ldl.fc.hp.com>
Date:	Mon, 5 Oct 2009 17:37:59 -0600
From:	Alex Chiang <achiang@...com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
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()

* 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?

> +			pdev = NULL;
> +			break;
> +		}
>  	}
>  out:
>  	list_for_each_entry_safe(node, tmp, &device_list, node)
> 
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/