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Subject: Re: [RFC PATCH 02/24] vhost-vdpa: fix vqs leak in vhost_vdpa_open()
To:     Eli Cohen <elic@nvidia.com>
Cc:     mst@redhat.com, lulu@redhat.com, kvm@vger.kernel.org,
        virtualization@lists.linux-foundation.org, netdev@vger.kernel.org,
        linux-kernel@vger.kernel.org, rob.miller@broadcom.com,
        lingshan.zhu@intel.com, eperezma@redhat.com, hanand@xilinx.com,
        mhabets@solarflare.com, eli@mellanox.com, amorenoz@redhat.com,
        maxime.coquelin@redhat.com, stefanha@redhat.com,
        sgarzare@redhat.com
References: <20200924032125.18619-1-jasowang@redhat.com>
 <20200924032125.18619-3-jasowang@redhat.com>
 <20200924074816.GC170403@mtl-vdi-166.wap.labs.mlnx>
From:   Jason Wang <jasowang@redhat.com>
Message-ID: <7237334f-10df-6d5b-dce9-c16b38166ae0@redhat.com>
Date:   Fri, 25 Sep 2020 19:41:37 +0800
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On 2020/9/24 下午3:48, Eli Cohen wrote:
> On Thu, Sep 24, 2020 at 11:21:03AM +0800, Jason Wang wrote:
>> We need to free vqs during the err path after it has been allocated
>> since vhost won't do that for us.
>>
>> Signed-off-by: Jason Wang <jasowang@redhat.com>
>> ---
>>   drivers/vhost/vdpa.c | 11 ++++++++---
>>   1 file changed, 8 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
>> index 796fe979f997..9c641274b9f3 100644
>> --- a/drivers/vhost/vdpa.c
>> +++ b/drivers/vhost/vdpa.c
>> @@ -764,6 +764,12 @@ static void vhost_vdpa_free_domain(struct vhost_vdpa *v)
>>   	v->domain = NULL;
>>   }
>>   
>> +static void vhost_vdpa_cleanup(struct vhost_vdpa *v)
>> +{
>> +	vhost_dev_cleanup(&v->vdev);
>> +	kfree(v->vdev.vqs);
>> +}
>> +
> Wouldn't it be cleaner to call kfree(vqs) explicilty inside
> vhost_vdpa_open() in case of failure and keep the symetry of
> vhost_dev_init()/vhost_dev_cleanup()?


That's also fine.

See 
https://www.mail-archive.com/virtualization@lists.linux-foundation.org/msg42558.html

I will use that for the next version.

Thanks.


>
>>   static int vhost_vdpa_open(struct inode *inode, struct file *filep)
>>   {
>>   	struct vhost_vdpa *v;
>> @@ -809,7 +815,7 @@ static int vhost_vdpa_open(struct inode *inode, struct file *filep)
>>   	return 0;
>>   
>>   err_init_iotlb:
>> -	vhost_dev_cleanup(&v->vdev);
>> +	vhost_vdpa_cleanup(v);
>>   err:
>>   	atomic_dec(&v->opened);
>>   	return r;
>> @@ -840,8 +846,7 @@ static int vhost_vdpa_release(struct inode *inode, struct file *filep)
>>   	vhost_vdpa_free_domain(v);
>>   	vhost_vdpa_config_put(v);
>>   	vhost_vdpa_clean_irq(v);
>> -	vhost_dev_cleanup(&v->vdev);
>> -	kfree(v->vdev.vqs);
>> +	vhost_vdpa_cleanup(v);
>>   	mutex_unlock(&d->mutex);
>>   
>>   	atomic_dec(&v->opened);
>> -- 
>> 2.20.1
>>