Re: [PATCH] virtio-serial-bus: fix memory leak while attach virtio-serial-bus

[Laurent Vivier <lvivier@redhat.com>]

On 02/12/2019 12:15, pannengyuan@huawei.com wrote:
> From: PanNengyuan <pannengyuan@huawei.com>
> 
> ivqs/ovqs/c_ivq/c_ovq is forgot to cleanup in
> virtio_serial_device_unrealize, the memory leak stack is as bellow:
> 
> Direct leak of 1290240 byte(s) in 180 object(s) allocated from:
>     #0 0x7fc9bfc27560 in calloc (/usr/lib64/libasan.so.3+0xc7560)
>     #1 0x7fc9bed6f015 in g_malloc0 (/usr/lib64/libglib-2.0.so.0+0x50015)
>     #2 0x5650e02b83e7 in virtio_add_queue /mnt/sdb/qemu-4.2.0-rc0/hw/virtio/virtio.c:2327
>     #3 0x5650e02847b5 in virtio_serial_device_realize /mnt/sdb/qemu-4.2.0-rc0/hw/char/virtio-serial-bus.c:1089
>     #4 0x5650e02b56a7 in virtio_device_realize /mnt/sdb/qemu-4.2.0-rc0/hw/virtio/virtio.c:3504
>     #5 0x5650e03bf031 in device_set_realized /mnt/sdb/qemu-4.2.0-rc0/hw/core/qdev.c:876
>     #6 0x5650e0531efd in property_set_bool /mnt/sdb/qemu-4.2.0-rc0/qom/object.c:2080
>     #7 0x5650e053650e in object_property_set_qobject /mnt/sdb/qemu-4.2.0-rc0/qom/qom-qobject.c:26
>     #8 0x5650e0533e14 in object_property_set_bool /mnt/sdb/qemu-4.2.0-rc0/qom/object.c:1338
>     #9 0x5650e04c0e37 in virtio_pci_realize /mnt/sdb/qemu-4.2.0-rc0/hw/virtio/virtio-pci.c:1801
> 
> Reported-by: Euler Robot <euler.robot@huawei.com>
> Signed-off-by: PanNengyuan <pannengyuan@huawei.com>
> ---
>  hw/char/virtio-serial-bus.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/hw/char/virtio-serial-bus.c b/hw/char/virtio-serial-bus.c
> index 3325904..da9019a 100644
> --- a/hw/char/virtio-serial-bus.c
> +++ b/hw/char/virtio-serial-bus.c
> @@ -1126,9 +1126,15 @@ static void virtio_serial_device_unrealize(DeviceState *dev, Error **errp)
>  {
>      VirtIODevice *vdev = VIRTIO_DEVICE(dev);
>      VirtIOSerial *vser = VIRTIO_SERIAL(dev);
> +    int i;
>  
>      QLIST_REMOVE(vser, next);
>  
> +    for (i = 0; i <= vser->bus.max_nr_ports; i++) {
> +        virtio_del_queue(vdev, 2 * i);
> +        virtio_del_queue(vdev, 2 * i + 1);
> +    }
> +

According to virtio_serial_device_realize() and the number of
virtio_add_queue(), I think you have more queues to delete:

  4 + 2 * vser->bus.max_nr_ports

(for vser->ivqs[0], vser->ovqs[0], vser->c_ivq, vser->c_ovq,
vser->ivqs[i], vser->ovqs[i]).

Thanks,
Laurent