diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index b1c9a27fe00f..32bf3ba07a9d 100644
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -689,6 +689,8 @@ static int virtblk_report_zones(struct gendisk *disk, sector_t sector,
 
 		nz = min_t(u64, virtio64_to_cpu(vblk->vdev, report->nr_zones),
 			   nr_zones);
+		nz = min_t(u64, nz,
+			   (buflen - sizeof(*report)) / sizeof(report->zones[0]));
 		if (!nz)
 			break;