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-rw-r--r--block/qcow2-cluster.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c
index 36c1bed350..9499df9ef2 100644
--- a/block/qcow2-cluster.c
+++ b/block/qcow2-cluster.c
@@ -380,6 +380,10 @@ static int coroutine_fn copy_sectors(BlockDriverState *bs,
BLKDBG_EVENT(bs->file, BLKDBG_COW_READ);
+ if (!bs->drv) {
+ return -ENOMEDIUM;
+ }
+
/* Call .bdrv_co_readv() directly instead of using the public block-layer
* interface. This avoids double I/O throttling and request tracking,
* which can lead to deadlock when block layer copy-on-read is enabled.