[PATCH v2 1/2] vdpa: Skip the maps not in the iova tree

["Eugenio Pérez" <eperezma@redhat.com>]

Next patch will skip the registering of dma maps that the vdpa device
rejects in the iova tree. We need to consider that here or we cause a
SIGSEGV accessing result.

Reported-by: Lei Yang <leiyang@redhat.com>
Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
---
 hw/virtio/vhost-vdpa.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c
index 3ff9ce3501..983d3697b0 100644
--- a/hw/virtio/vhost-vdpa.c
+++ b/hw/virtio/vhost-vdpa.c
@@ -289,6 +289,10 @@ static void vhost_vdpa_listener_region_del(MemoryListener *listener,
         };
 
         result = vhost_iova_tree_find_iova(v->iova_tree, &mem_region);
+        if (!result) {
+            /* The memory listener map wasn't mapped */
+            return;
+        }
         iova = result->iova;
         vhost_iova_tree_remove(v->iova_tree, result);
     }
-- 
2.31.1