linux-kernel - Re: [BUG][PATCH] cpqphp: fix kernel NULL pointer dereference

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Date:	Thu, 16 Oct 2008 18:33:34 -0600
From:	Alex Chiang <achiang@...com>
To:	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>
Cc:	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Yinghai Lu <yinghai@...nel.org>, stable@...nel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [BUG][PATCH] cpqphp: fix kernel NULL pointer dereference

* Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>:
> 
> The root cause of this problem seems that cpqphp driver calls
> pci_hp_register() wrongly. In current implementation, cpqphp driver
> passes 'ctrl->pci_dev->subordinate' as a second parameter for
> pci_hp_register(). But because hotplug slots and it's hotplug
> controller (exists as a pci funcion) are on the same bus, it should be
> 'ctrl->pci_dev->bus' instead.
> 
> Cc: <stable@...nel.org>

Acked-by: Alex Chiang <achiang@...com>

> Tested-by: Ingo Molnar <mingo@...e.hu>
> Signed-off-by: Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>
> 
> ---
>  drivers/pci/hotplug/cpqphp_core.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> Index: linux-2.6-tip/drivers/pci/hotplug/cpqphp_core.c
> ===================================================================
> --- linux-2.6-tip.orig/drivers/pci/hotplug/cpqphp_core.c
> +++ linux-2.6-tip/drivers/pci/hotplug/cpqphp_core.c
> @@ -435,7 +435,7 @@ static int ctrl_slot_setup(struct contro
>  				slot->number, ctrl->slot_device_offset,
>  				slot_number);
>  		result = pci_hp_register(hotplug_slot,
> -					 ctrl->pci_dev->subordinate,
> +					 ctrl->pci_dev->bus,
>  					 slot->device);
>  		if (result) {
>  			err("pci_hp_register failed with error %d\n", result);
> 
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