linux-kernel - Re: [PATCH] ACPI / PNP: Do not crash due to stale pointer use during system resume

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Message-ID: <CAKocOOOsOZ=g45cdFSZZoCVMBxf9aWNSa4RdGNCuAEKrxXkr1Q@mail.gmail.com>
Date:	Thu, 29 Nov 2012 16:25:20 -0700
From:	Shuah Khan <shuahkhan@...il.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux PM list <linux-pm@...r.kernel.org>,
	Zdenek Kabelac <zdenek.kabelac@...il.com>
Subject: Re: [PATCH] ACPI / PNP: Do not crash due to stale pointer use during
 system resume

On Thu, Nov 29, 2012 at 4:10 PM, Rafael J. Wysocki <rjw@...k.pl> wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
>
> During resume from system suspend the 'data' field of
> struct pnp_dev in pnpacpi_set_resources() may be a stale pointer,
> due to removal of the associated ACPI device node object in the
> previous suspend-resume cycle.  This happens, for example, if a
> dockable machine is booted in the docking station and then suspended
> and resumed and suspended again.  If that happens,
> pnpacpi_build_resource_template() called from pnpacpi_set_resources()
> attempts to use that pointer and crashes.
>
> However, pnpacpi_set_resources() actually checks the device's ACPI
> handle, attempts to find the ACPI device node object attached to it
> and returns an error code if that fails, so in fact it knows what the
> correct value of dev->data should be.  Use this observation to update
> dev->data with the correct value if necessary and dump a call trace
> if that's the case (once).
>
> We still need to fix the root cause of this issue, but preventing
> systems from crashing because of it is an improvement too.
>
> Reported-and-tested-by: Zdenek Kabelac <zdenek.kabelac@...il.com>
> References: https://bugzilla.kernel.org/show_bug.cgi?id=51071
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

Any reason why this shouldn't go into stable releases?

-- Shuah
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