linux-kernel - Re: [PATCH] ACPI: Fix potential NULL pointer dereference in acpi_processor

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Date:	Wed, 29 May 2013 13:07:35 +0200
From:	Martin Mokrejs <mmokrejs@...d.natur.cuni.cz>
To:	Hanjun Guo <hanjun.guo@...aro.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>
CC:	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	patches@...aro.org, linaro-kernel@...ts.linaro.org
Subject: Re: [PATCH] ACPI: Fix potential NULL pointer dereference in acpi_processor_add()

Hanjun Guo wrote:
> On 2013-5-29 7:30, Rafael J. Wysocki wrote:
>> On Thursday, May 23, 2013 08:44:26 PM Hanjun Guo wrote:
>>> In acpi_processor_add(), get_cpu_device() will return NULL sometimes,
>>> although the chances are small, I think it should be fixed.
>>>
>>> Signed-off-by: Hanjun Guo <hanjun.guo@...aro.org>
>>
>> This patch isn't necessary any more after the changes queued up for 3.11
>> in the acpi-hotplug branch of the linux-pm.git tree.
> 
> Ok, I noticed your patch set, just drop my patch.

But shouldn't this go to stable at least? I checked linux-3.9.4
and it applies fine. Whether this is relevant for other stable
series I will leave up to somebody else. ;)
Martin

> 
> Thanks
> Hanjun
> 
>>
>> Thanks,
>> Rafael
>>
>>
>>> ---
>>>  drivers/acpi/processor_driver.c |    4 ++++
>>>  1 files changed, 4 insertions(+), 0 deletions(-)
>>>
>>> diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c
>>> index bec717f..dd64f23 100644
>>> --- a/drivers/acpi/processor_driver.c
>>> +++ b/drivers/acpi/processor_driver.c
>>> @@ -579,6 +579,10 @@ static int __cpuinit acpi_processor_add(struct acpi_device
>>> *device)
>>>         per_cpu(processors, pr->id) = pr;
>>>
>>>         dev = get_cpu_device(pr->id);
>>> +       if (!dev) {
>>> +               result = -ENODEV;
>>> +               goto err_clear_processor;
>>> +       }
>>>         if (sysfs_create_link(&device->dev.kobj, &dev->kobj, "sysdev")) {
>>>                 result = -EFAULT;
>>>                 goto err_clear_processor;
>>>
> 
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