vfio/container: Fix SIGSEGV when open container file fails

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.duan@intel.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/qemu-devel/20250623102235.94877-2-zhenzhong.duan@intel.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>

diff --git a/hw/vfio/container.c b/hw/vfio/container.c
index 3e8d645ebbd7b13c55625f38f4250670a63df124..2853f6f08b5d3f199b7f2c22de884ec6b57279ce 100644 (file)
--- 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);