[Qemu-devel] [PATCH v2] ivshmem: fix memory backend leak

[Igor Mammedov <imammedo@redhat.com>]

object_new() returns a new backend with refcount == 1 and
then later object_property_add_child() increases refcount to 2
So when ivshmem is destroyed, the backend it has created isn't
destroyed along with it as children cleanup will bring
backend's refcount only to 1, which leaks backend including
resources it is using.

Drop the original reference from object_new() once backend
is attached to its parent.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
---
 v2:
  *   s/desroyed/destroyed/
        Philippe Mathieu-Daudé <philmd@redhat.com>
  * pick up Mark's Rb
---
 hw/misc/ivshmem.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/hw/misc/ivshmem.c b/hw/misc/ivshmem.c
index f88910e..ecfd10a 100644
--- a/hw/misc/ivshmem.c
+++ b/hw/misc/ivshmem.c
@@ -1279,6 +1279,7 @@ static void desugar_shm(IVShmemState *s)
     object_property_set_bool(obj, true, "share", &error_abort);
     object_property_add_child(OBJECT(s), "internal-shm-backend", obj,
                               &error_abort);
+    object_unref(obj);
     user_creatable_complete(obj, &error_abort);
     s->hostmem = MEMORY_BACKEND(obj);
 }
-- 
2.7.4