vhost-user-gpu: fix cursor move/update

"move" is incorrectly initialized.

Fix it by using a switch statement and also treating unknown commands
with a fallback.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20210312100108.2706195-5-marcandre.lureau@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

Author: elmarco

contrib/vhost-user-gpu/vhost-user-gpu.c

@@ -892,11 +892,8 @@ update_cursor_data_simple(VuGpu *g, uint32_t resource_id, gpointer data)
 static void
 vg_process_cursor_cmd(VuGpu *g, struct virtio_gpu_update_cursor *cursor)
 {
-    bool move = cursor->hdr.type != VIRTIO_GPU_CMD_MOVE_CURSOR;
-
-    g_debug("%s move:%d\n", G_STRFUNC, move);
-
-    if (move) {
+    switch (cursor->hdr.type) {
+    case VIRTIO_GPU_CMD_MOVE_CURSOR: {
         VhostUserGpuMsg msg = {
             .request = cursor->resource_id ?
                 VHOST_USER_GPU_CURSOR_POS : VHOST_USER_GPU_CURSOR_POS_HIDE,
@@ -907,8 +904,11 @@ vg_process_cursor_cmd(VuGpu *g, struct virtio_gpu_update_cursor *cursor)
                 .y = cursor->pos.y,
             }
         };
+        g_debug("%s: move", G_STRFUNC);
         vg_send_msg(g, &msg, -1);
-    } else {
+        break;
+    }
+    case VIRTIO_GPU_CMD_UPDATE_CURSOR: {
         VhostUserGpuMsg msg = {
             .request = VHOST_USER_GPU_CURSOR_UPDATE,
             .size = sizeof(VhostUserGpuCursorUpdate),
@@ -922,6 +922,7 @@ vg_process_cursor_cmd(VuGpu *g, struct virtio_gpu_update_cursor *cursor)
                 .hot_y = cursor->hot_y,
             }
         };
+        g_debug("%s: update", G_STRFUNC);
         if (g->virgl) {
             vg_virgl_update_cursor_data(g, cursor->resource_id,
                                         msg.payload.cursor_update.data);
@@ -930,6 +931,11 @@ vg_process_cursor_cmd(VuGpu *g, struct virtio_gpu_update_cursor *cursor)
                                       msg.payload.cursor_update.data);
         }
         vg_send_msg(g, &msg, -1);
+        break;
+    }
+    default:
+        g_debug("%s: unknown cmd %d", G_STRFUNC, cursor->hdr.type);
+        break;
     }
 }