Re: [PATCH 1/2] virtio-blk: delete vqs on the error path in realize()

[Pan Nengyuan]

On 3/27/2020 4:41 PM, Stefano Garzarella wrote:
> On Fri, Mar 27, 2020 at 11:56:49AM +0800, Pan Nengyuan wrote:
>> virtio_vqs forgot to free on the error path in realize(). Fix that.
>>
>> The asan stack:
>> Direct leak of 14336 byte(s) in 1 object(s) allocated from:
>>     #0 0x7f58b93fd970 in __interceptor_calloc (/lib64/libasan.so.5+0xef970)
>>     #1 0x7f58b858249d in g_malloc0 (/lib64/libglib-2.0.so.0+0x5249d)
>>     #2 0x5562cc627f49 in virtio_add_queue 
>> /mnt/sdb/qemu/hw/virtio/virtio.c:2413
>>     #3 0x5562cc4b524a in virtio_blk_device_realize 
>> /mnt/sdb/qemu/hw/block/virtio-blk.c:1202
>>     #4 0x5562cc613050 in virtio_device_realize 
>> /mnt/sdb/qemu/hw/virtio/virtio.c:3615
>>     #5 0x5562ccb7a568 in device_set_realized /mnt/sdb/qemu/hw/core/qdev.c:891
>>     #6 0x5562cd39cd45 in property_set_bool /mnt/sdb/qemu/qom/object.c:2238
>>
>> Reported-by: Euler Robot <address@hidden>
>> Signed-off-by: Pan Nengyuan <address@hidden>
>> ---
>> Cc: Stefan Hajnoczi <address@hidden>
>> Cc: Kevin Wolf <address@hidden>
>> Cc: Max Reitz <address@hidden>
>> Cc: address@hidden
>> ---
>>  hw/block/virtio-blk.c | 8 ++++++--
>>  1 file changed, 6 insertions(+), 2 deletions(-)
>>
>> diff --git a/hw/block/virtio-blk.c b/hw/block/virtio-blk.c
>> index 142863a3b2..a6682c2ced 100644
>> --- a/hw/block/virtio-blk.c
>> +++ b/hw/block/virtio-blk.c
>> @@ -1204,8 +1204,7 @@ static void virtio_blk_device_realize(DeviceState 
>> *dev, Error **errp)
>>      virtio_blk_data_plane_create(vdev, conf, &s->dataplane, &err);
>>      if (err != NULL) {
>>          error_propagate(errp, err);
>> -        virtio_cleanup(vdev);
>> -        return;
>> +        goto fail;
>>      }
>>  
>>      s->change = qemu_add_vm_change_state_handler(virtio_blk_dma_restart_cb, 
>> s);
>> @@ -1218,6 +1217,11 @@ static void virtio_blk_device_realize(DeviceState 
>> *dev, Error **errp)
>>                           conf->conf.lcyls,
>>                           conf->conf.lheads,
>>                           conf->conf.lsecs);
> 
> I think we should add a return here, otherwise we will remove the virt
> queues also in the success case.

Yes, I have sent a new version v2 and changed it, you can review on it.

Thanks.

> 
> Thanks,
> Stefano
> 
>> +fail:
>> +    for (i = 0; i < conf->num_queues; i++) {
>> +        virtio_del_queue(vdev, i);
>> +    }
>> +    virtio_cleanup(vdev);
>>  }
>>  
>>  static void virtio_blk_device_unrealize(DeviceState *dev, Error **errp)
>> -- 
>> 2.18.2
>>
>>
> 
> .
>