linux-kernel - Re: [PATCH 2/2] ACPI, PCI, ISA: Fix memory leak when there is no IRQ in the ACPI subsystem.

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Date:	Wed, 19 Feb 2014 11:26:47 +0100
From:	Tomasz Nowicki <tomasz.nowicki@...aro.org>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
CC:	lenb@...nel.org, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] ACPI, PCI, ISA: Fix memory leak when there is no
 IRQ in the ACPI subsystem.

On 18.02.2014 16:26, Rafael J. Wysocki wrote:
> On Tuesday, February 18, 2014 11:21:39 AM Tomasz Nowicki wrote:
>> On 18.02.2014 02:02, Rafael J. Wysocki wrote:
>>> On Monday, February 10, 2014 02:00:11 PM Tomasz Nowicki wrote:
>>>> Whenever we register ISA interrupt or not, we need to free the IRQ routing
>>>> table entry.
>>>>
>>>> Signed-off-by: Tomasz Nowicki <tomasz.nowicki@...aro.org>
>>>> ---
>>>>    drivers/acpi/pci_irq.c |    1 +
>>>>    1 file changed, 1 insertion(+)
>>>>
>>>> diff --git a/drivers/acpi/pci_irq.c b/drivers/acpi/pci_irq.c
>>>> index b0e31b6..6ec0f36 100644
>>>> --- a/drivers/acpi/pci_irq.c
>>>> +++ b/drivers/acpi/pci_irq.c
>>>> @@ -432,6 +432,7 @@ int acpi_pci_irq_enable(struct pci_dev *dev)
>>>>    #endif
>>>>    		dev_warn(&dev->dev, "PCI INT %c: no GSI\n", pin_name(pin));
>>>>
>>>> +		kfree(entry);
>>>
>>> If I'm not mistaken, entry is always NULL here, isn't it?
>>
>> acpi_pci_link_allocate_irq() can return negative gsi even if entry !=
>> NULL. For that case we'd have memory leak.
>
> And that's what your changelog should be saying, isn't it?
It should, sorry.
>
> Queued up for 3.14 and marked for -stable.  I had to rebase it, though, so
> please check the result in linux-pm.git/linux-next.
It's OK. Thanks.

Tomasz
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