linux-kernel - Re: [PATCH 2/2] ACPI / bind: Use (put|get)

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Date:	Thu, 14 Nov 2013 11:43:48 +0900
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux PCI <linux-pci@...r.kernel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Aaron Lu <aaron.lu@...el.com>,
	Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
	Lan Tianyu <tianyu.lan@...el.com>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	"Luck, Tony" <tony.luck@...el.com>
Subject: Re: [PATCH 2/2] ACPI / bind: Use (put|get)_device() on ACPI device
 objects too

On Thu, Nov 14, 2013 at 12:26:47AM +0100, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> 
> When associating a "physical" device with an ACPI device object
> acpi_bind_one() only uses get_device() to increment the reference
> counter of the former, but there is no reason not to do that with
> the latter too.  Among other things, that may help to avoid
> use-after-free when an ACPI device object is freed without calling
> acpi_unbind_one() for all "physical" devices associated with it
> (that only can happen in buggy code, but then it's better if the
> kernel doesn't crash as a result of a bug).
> 
> For this reason, modify acpi_bind_one() to apply get_device() to
> the ACPI device object too and update acpi_unbind_one() to drop
> that reference using put_device() as appropriate.
> 
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

Acked-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
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