linux-kernel - Re: [PATCH v2] Check the node argument passed to cpumask_of

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Message-ID: <4B41D42A.9040008@xenontk.org>
Date:	Mon, 04 Jan 2010 17:12:34 +0530
From:	David John <davidjon@...ontk.org>
To:	Rusty Russell <rusty@...tcorp.com.au>
CC:	jbarnes@...tuousgeek.org, andreas.herrmann3@....com, rjw@...k.pl,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] Check the node argument passed to cpumask_of_node

On 01/04/2010 09:58 AM, Rusty Russell wrote:
> On Sat, 2 Jan 2010 04:45:47 pm David John wrote:
>> Commit e0cd516 "PCI: derive nearby CPUs from device's instead of bus' NUMA information"
>> causes an null pointer dereference when reading from the sysfs attributes local_cpu*
>> on Intel machines with no ACPI NUMA proximity info, since dev->numa_node gets set to -1
>> for all PCI devices, which then gets passed to cpumask_of_node.
>>
>> Ensure that the node value is valid.
> 
> This only works for x86, and only for !CONFIG_DEBUG_PER_CPU_MAPS.
> 
> I suggest fixing the callers introduced in e0cd516 for the moment,
> then if you feel enthused, change the semantics of cpumask_of_node and
> remove the checks from the various callers.

Okay, I'll do as you suggested.

Regards,
David.
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