linux-kernel - Re: [PATCH v3] Check the node argument passed to cpumask_of

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Message-ID: <20100104091849.58d85bae@jbarnes-piketon>
Date:	Mon, 4 Jan 2010 09:18:49 -0800
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	David John <davidjon@...ontk.org>
Cc:	rusty@...tcorp.com.au, andreas.herrmann3@....com, rjw@...k.pl,
	jin.dongming@...css.fujitsu.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] Check the node argument passed to cpumask_of_node

On Mon,  4 Jan 2010 20:28:57 +0530
David John <davidjon@...ontk.org> 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.
> 
> Add a check to prevent this.
> 
> Signed-off-by: David John <davidjon@...ontk.org>
> 
> diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
> index c5df94e..807224e 100644
> --- a/drivers/pci/pci-sysfs.c
> +++ b/drivers/pci/pci-sysfs.c
> @@ -75,7 +75,8 @@ static ssize_t local_cpus_show(struct device *dev,
>  	int len;
>  
>  #ifdef CONFIG_NUMA
> -	mask = cpumask_of_node(dev_to_node(dev));
> +	mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
> +
> cpumask_of_node(dev_to_node(dev)); #else
>  	mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
>  #endif
> @@ -93,7 +94,8 @@ static ssize_t local_cpulist_show(struct device
> *dev, int len;
>  
>  #ifdef CONFIG_NUMA
> -	mask = cpumask_of_node(dev_to_node(dev));
> +	mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
> +
> cpumask_of_node(dev_to_node(dev)); #else
>  	mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
>  #endif
> 

Applied to my for-linus branch, thanks David.

-- 
Jesse Barnes, Intel Open Source Technology Center
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