[PATCH] virtio-pci: fix memory leak from device realization failure

[Zheng Huang <hz1624917200@gmail.com>]

This commit adds failback routine for `virtio_pci_realize` to 
fix the memory leak of an address space and the virtio-net device object.
If the realization of the device failed, the address space should be 
destroyed too.

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2845

Signed-off-by: Zheng Huang <hz1624917200@outlook.com>

---
 hw/virtio/virtio-pci.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
index c773a9130c..4b0d8cd90a 100644
--- a/hw/virtio/virtio-pci.c
+++ b/hw/virtio/virtio-pci.c
@@ -2266,6 +2266,9 @@ static void virtio_pci_realize(PCIDevice *pci_dev, Error **errp)
     virtio_pci_bus_new(&proxy->bus, sizeof(proxy->bus), proxy);
     if (k->realize) {
         k->realize(proxy, errp);
+        if (*errp) {
+            address_space_destroy(&proxy->modern_cfg_mem_as);
+        }
     }
 }
 
-- 
2.34.1