[PATCH 1/4] vfio/container: Fix SIGSEGV when open container file fails

[Zhenzhong Duan]

When open /dev/vfio/vfio fails, SIGSEGV triggers because
vfio_listener_unregister() doesn't support a NULL bcontainer
pointer.

Fixes: a1f267a7d4d9 ("vfio/container: reform vfio_container_connect cleanup")
Signed-off-by: Zhenzhong Duan <zhenzhong.d...@intel.com>
---
 hw/vfio/container.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/hw/vfio/container.c b/hw/vfio/container.c
index 3e8d645ebb..2853f6f08b 100644
--- a/hw/vfio/container.c
+++ b/hw/vfio/container.c
@@ -710,7 +710,9 @@ static bool vfio_container_connect(VFIOGroup *group, 
AddressSpace *as,
     return true;
 
 fail:
-    vfio_listener_unregister(bcontainer);
+    if (new_container) {
+        vfio_listener_unregister(bcontainer);
+    }
 
     if (group_was_added) {
         vfio_container_group_del(container, group);
-- 
2.34.1