1 files changed, 2 insertions, 0 deletions
diff --git a/block/io.c b/block/io.c
index 86e5ea3..d9c1594 100644
--- a/block/io.c
+++ b/block/io.c
@@ -3532,6 +3532,7 @@ bdrv_co_preadv_snapshot(BdrvChild *child, int64_t offset, int64_t bytes,
     BlockDriver *drv = bs->drv;
     int ret;
     IO_CODE();
+    assert_bdrv_graph_readable();
 
     if (!drv) {
         return -ENOMEDIUM;
@@ -3557,6 +3558,7 @@ bdrv_co_snapshot_block_status(BlockDriverState *bs,
     BlockDriver *drv = bs->drv;
     int ret;
     IO_CODE();
+    assert_bdrv_graph_readable();
 
     if (!drv) {
         return -ENOMEDIUM;