--- a/block/bio.c
+++ b/block/bio.c
@@ -691,6 +691,9 @@ static void bio_truncate(struct bio *bio, unsigned new_size)
  */
 void guard_bio_eod(struct bio *bio)
 {
+	if (unlikely(!bio->bi_bdev)
+		return;
+
 	sector_t maxsector = bdev_nr_sectors(bio->bi_bdev);
 
 	if (!maxsector)