diff --git a/drivers/block/null_blk_main.c b/drivers/block/null_blk_main.c
index 8efd877..ce9e336 100644
--- a/drivers/block/null_blk_main.c
+++ b/drivers/block/null_blk_main.c
@@ -1535,6 +1535,13 @@
 {
 	if (nullb->dev->discard == false)
 		return;
+
+	if (nullb->dev->zoned) {
+		nullb->dev->discard = false;
+		pr_info("discard option is ignored in zoned mode\n");
+		return;
+	}
+
 	nullb->q->limits.discard_granularity = nullb->dev->blocksize;
 	nullb->q->limits.discard_alignment = nullb->dev->blocksize;
 	blk_queue_max_discard_sectors(nullb->q, UINT_MAX >> 9);
diff --git a/drivers/block/null_blk_zoned.c b/drivers/block/null_blk_zoned.c
index 9e4bcda..ed5458f 100644
--- a/drivers/block/null_blk_zoned.c
+++ b/drivers/block/null_blk_zoned.c
@@ -23,6 +23,10 @@
 		pr_err("zone_size must be power-of-two\n");
 		return -EINVAL;
 	}
+	if (dev->zone_size > dev->size) {
+		pr_err("Zone size larger than device capacity\n");
+		return -EINVAL;
+	}
 
 	dev->zone_size_sects = dev->zone_size << ZONE_SIZE_SHIFT;
 	dev->nr_zones = dev_size >>