[PATCH 1/2] vhost-user-blk: delete virtioqueues in unrealize to fix memleaks

[<pannengyuan@huawei.com>]

From: Pan Nengyuan <pannengyuan@huawei.com>

virtio queues forgot to delete in unrealize, and aslo error path in
realize, this patch fix these memleaks, the leak stack is as follow:

Direct leak of 114688 byte(s) in 16 object(s) allocated from:
    #0 0x7f24024fdbf0 in calloc (/lib64/libasan.so.3+0xcabf0)
    #1 0x7f2401642015 in g_malloc0 (/lib64/libglib-2.0.so.0+0x50015)
    #2 0x55ad175a6447 in virtio_add_queue /mnt/sdb/qemu/hw/virtio/virtio.c:2327
    #3 0x55ad17570cf9 in vhost_user_blk_device_realize /mnt/sdb/qemu/hw/block/vhost-user-blk.c:419
    #4 0x55ad175a3707 in virtio_device_realize /mnt/sdb/qemu/hw/virtio/virtio.c:3509
    #5 0x55ad176ad0d1 in device_set_realized /mnt/sdb/qemu/hw/core/qdev.c:876
    #6 0x55ad1781ff9d in property_set_bool /mnt/sdb/qemu/qom/object.c:2080
    #7 0x55ad178245ae in object_property_set_qobject /mnt/sdb/qemu/qom/qom-qobject.c:26
    #8 0x55ad17821eb4 in object_property_set_bool /mnt/sdb/qemu/qom/object.c:1338
    #9 0x55ad177aeed7 in virtio_pci_realize /mnt/sdb/qemu/hw/virtio/virtio-pci.c:1801

Reported-by: Euler Robot <euler.robot@huawei.com>
Signed-off-by: Pan Nengyuan <pannengyuan@huawei.com>
---
 hw/block/vhost-user-blk.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/hw/block/vhost-user-blk.c b/hw/block/vhost-user-blk.c
index d8c459c575..2eba8b9db0 100644
--- a/hw/block/vhost-user-blk.c
+++ b/hw/block/vhost-user-blk.c
@@ -460,6 +460,9 @@ reconnect:
 virtio_err:
     g_free(s->vqs);
     g_free(s->inflight);
+    for (i = 0; i < s->num_queues; i++) {
+        virtio_del_queue(vdev, i);
+    }
     virtio_cleanup(vdev);
     vhost_user_cleanup(&s->vhost_user);
 }
@@ -468,6 +471,7 @@ static void vhost_user_blk_device_unrealize(DeviceState *dev, Error **errp)
 {
     VirtIODevice *vdev = VIRTIO_DEVICE(dev);
     VHostUserBlk *s = VHOST_USER_BLK(dev);
+    int i;
 
     virtio_set_status(vdev, 0);
     qemu_chr_fe_set_handlers(&s->chardev,  NULL, NULL, NULL,
@@ -476,6 +480,10 @@ static void vhost_user_blk_device_unrealize(DeviceState *dev, Error **errp)
     vhost_dev_free_inflight(s->inflight);
     g_free(s->vqs);
     g_free(s->inflight);
+
+    for (i = 0; i < s->num_queues; i++) {
+        virtio_del_queue(vdev, i);
+    }
     virtio_cleanup(vdev);
     vhost_user_cleanup(&s->vhost_user);
 }
-- 
2.21.0.windows.1