[PATCH v2 1/2] virtio-9p-device: fix memleak in virtio_9p_device_unrealize

[pannengyuan]

From: Pan Nengyuan <pannengy...@huawei.com>

v->vq forgot to cleanup in virtio_9p_device_unrealize, the memory leak
stack is as follow:

Direct leak of 14336 byte(s) in 2 object(s) allocated from:
  #0 0x7f819ae43970 (/lib64/libasan.so.5+0xef970)  ??:?
  #1 0x7f819872f49d (/lib64/libglib-2.0.so.0+0x5249d)  ??:?
  #2 0x55a3a58da624 (./x86_64-softmmu/qemu-system-x86_64+0x2c14624)  
/mnt/sdb/qemu/hw/virtio/virtio.c:2327
  #3 0x55a3a571bac7 (./x86_64-softmmu/qemu-system-x86_64+0x2a55ac7)  
/mnt/sdb/qemu/hw/9pfs/virtio-9p-device.c:209
  #4 0x55a3a58e7bc6 (./x86_64-softmmu/qemu-system-x86_64+0x2c21bc6)  
/mnt/sdb/qemu/hw/virtio/virtio.c:3504
  #5 0x55a3a5ebfb37 (./x86_64-softmmu/qemu-system-x86_64+0x31f9b37)  
/mnt/sdb/qemu/hw/core/qdev.c:876

Reported-by: Euler Robot <euler.ro...@huawei.com>
Signed-off-by: Pan Nengyuan <pannengy...@huawei.com>
---
Changes V2 to V1:
- use old function virtio_del_queue to make it easier for stable branch
to merge (suggested by Christian Schoenebeck)
---
 hw/9pfs/virtio-9p-device.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/hw/9pfs/virtio-9p-device.c b/hw/9pfs/virtio-9p-device.c
index b5a7c03f26..910dc5045e 100644
--- a/hw/9pfs/virtio-9p-device.c
+++ b/hw/9pfs/virtio-9p-device.c
@@ -215,6 +215,7 @@ static void virtio_9p_device_unrealize(DeviceState *dev, 
Error **errp)
     V9fsVirtioState *v = VIRTIO_9P(dev);
     V9fsState *s = &v->state;
 
+    virtio_del_queue(vdev, 0);
     virtio_cleanup(vdev);
     v9fs_device_unrealize_common(s, errp);
 }
-- 
2.21.0.windows.1