diff --git a/drivers/vhost/iotlb.c b/drivers/vhost/iotlb.c
index 670d56c879e5..5829cf2d0552 100644
--- a/drivers/vhost/iotlb.c
+++ b/drivers/vhost/iotlb.c
@@ -57,6 +57,21 @@ int vhost_iotlb_add_range_ctx(struct vhost_iotlb *iotlb,
 	if (last < start)
 		return -EFAULT;
 
+	/* If the range being mapped is [0, ULONG_MAX], split it into two entries
+	 * otherwise its size would overflow u64.
+	 */
+	if (start == 0 && last == ULONG_MAX) {
+		u64 mid = last / 2;
+		int err = vhost_iotlb_add_range_ctx(iotlb, start, mid, addr,
+				perm, opaque);
+
+		if (err)
+			return err;
+
+		addr += mid + 1;
+		start = mid + 1;
+	}
+
 	if (iotlb->limit &&
 	    iotlb->nmaps == iotlb->limit &&
 	    iotlb->flags & VHOST_IOTLB_FLAG_RETIRE) {
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index 59edb5a1ffe2..55475fd59fb7 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -1170,6 +1170,11 @@ ssize_t vhost_chr_write_iter(struct vhost_dev *dev,
 		goto done;
 	}
 
+	if (msg.size == 0) {
+		ret = -EINVAL;
+		goto done;
+	}
+
 	if (dev->msg_handler)
 		ret = dev->msg_handler(dev, &msg);
 	else