diff --git a/dump/dump.c b/dump/dump.c
index 7ede5508..3d77bb9b 100644
--- a/dump/dump.c
+++ b/dump/dump.c
@@ -90,6 +90,12 @@ static int exfat_show_ondisk_all_info(struct exfat_blk_dev *bd)
 		goto free_ppbr;
 	}
 
+	if (memcmp(ppbr->bpb.oem_name, "EXFAT   ", 8) != 0) {
+		exfat_err("Bad fs_name in boot sector, which does not describe a valid exfat filesystem\n");
+		ret = -EINVAL;
+		goto free_ppbr;
+	}
+
 	pbsx = &ppbr->bsx;
 
 	if (pbsx->sect_size_bits < EXFAT_MIN_SECT_SIZE_BITS ||
diff --git a/lib/libexfat.c b/lib/libexfat.c
index c1c9b037..42e3fdc1 100644
--- a/lib/libexfat.c
+++ b/lib/libexfat.c
@@ -374,6 +374,12 @@ off_t exfat_get_root_entry_offset(struct exfat_blk_dev *bd)
 		return -1;
 	}
 
+	if (memcmp(bs->bpb.oem_name, "EXFAT   ", 8) != 0) {
+		exfat_err("Bad fs_name in boot sector, which does not describe a valid exfat filesystem\n");
+		free(bs);
+		return -1;
+	}
+
 	sector_size = 1 << bs->bsx.sect_size_bits;
 	cluster_size = (1 << bs->bsx.sect_per_clus_bits) * sector_size;
 	root_clu_off = le32_to_cpu(bs->bsx.clu_offset) * sector_size +
@@ -546,6 +552,12 @@ int exfat_show_volume_serial(int fd)
 		goto free_ppbr;
 	}
 
+	if (memcmp(ppbr->bpb.oem_name, "EXFAT   ", 8) != 0) {
+		exfat_err("Bad fs_name in boot sector, which does not describe a valid exfat filesystem\n");
+		ret = -1;
+		goto free_ppbr;
+	}
+
 	exfat_info("volume serial : 0x%x\n", ppbr->bsx.vol_serial);
 
 free_ppbr:
@@ -614,6 +626,12 @@ int exfat_set_volume_serial(struct exfat_blk_dev *bd,
 		goto free_ppbr;
 	}
 
+	if (memcmp(ppbr->bpb.oem_name, "EXFAT   ", 8) != 0) {
+		exfat_err("Bad fs_name in boot sector, which does not describe a valid exfat filesystem\n");
+		ret = -1;
+		goto free_ppbr;
+	}
+
 	bd->sector_size = 1 << ppbr->bsx.sect_size_bits;
 	ppbr->bsx.vol_serial = ui->volume_serial;