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

[pannengyuan]

From: PanNengyuan <address@hidden>

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 <address@hidden>
Signed-off-by: PanNengyuan <address@hidden>
---
 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);
+    }
+
     g_free(vser->ivqs);
     g_free(vser->ovqs);
     g_free(vser->ports_map);
-- 
2.7.2.windows.1