--- util-linux-ng-2.17/shlibs/blkid/src/superblocks/drbd.c
+++ util-linux-ng-2.17/shlibs/blkid/src/superblocks/drbd.c
@@ -78,7 +78,9 @@
 		blkid_probe_get_buffer(pr,
 		off,
 		sizeof(struct md_on_disk_08));
-
+	
+	if(!md)
+		return -1;
 
 	if (be32_to_cpu(md->magic) != DRBD_MD_MAGIC_08)
 		return -1;