linux-kernel - Re: [PATCH] vfio/platform: Remove unnecessary free in vfio_set

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Message-ID: <0063df77-aede-4365-819e-5ec8eb6c5b3f@kylinos.cn>
Date: Mon, 15 Jan 2024 14:08:39 +0800
From: Kunwu Chan <chentao@...inos.cn>
To: Alex Williamson <alex.williamson@...hat.com>
Cc: eric.auger@...hat.com, a.motakis@...tualopensystems.com,
 b.reynal@...tualopensystems.com, kvm@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] vfio/platform: Remove unnecessary free in
 vfio_set_trigger

On 2024/1/12 23:34, Alex Williamson wrote:
> On Fri, 12 Jan 2024 14:41:07 +0800
> Kunwu Chan <chentao@...inos.cn> wrote:
> 
>> commit 57f972e2b341 ("vfio/platform: trigger an interrupt via eventfd")
>> add 'name' as member for vfio_platform_irq,it's initialed by kasprintf,
>> so there is no need to free it before initializing.
> 
> What?!  Just look at the call path where vfio_set_trigger() is called
> with a valid fd and existing trigger.  This change would leak irq->name
> as it's reallocated via kasprintf().  Thanks,
> 
> Alex
>   
>> Fixes: 57f972e2b341 ("vfio/platform: trigger an interrupt via eventfd")
>> Signed-off-by: Kunwu Chan <chentao@...inos.cn>
>> ---
>>   drivers/vfio/platform/vfio_platform_irq.c | 1 -
>>   1 file changed, 1 deletion(-)
>>
>> diff --git a/drivers/vfio/platform/vfio_platform_irq.c b/drivers/vfio/platform/vfio_platform_irq.c
>> index 61a1bfb68ac7..5e3fd1926366 100644
>> --- a/drivers/vfio/platform/vfio_platform_irq.c
>> +++ b/drivers/vfio/platform/vfio_platform_irq.c
>> @@ -179,7 +179,6 @@ static int vfio_set_trigger(struct vfio_platform_device *vdev, int index,
>>   	if (irq->trigger) {
>>   		irq_clear_status_flags(irq->hwirq, IRQ_NOAUTOEN);
>>   		free_irq(irq->hwirq, irq);
>> -		kfree(irq->name);
>>   		eventfd_ctx_put(irq->trigger);
>>   		irq->trigger = NULL;
>>   	}
> 
Thanks for your reply.

It's my bad.I misunderstood. Sorry to bother you.
-- 
Thanks,
   Kunwu