use memcpy() to cope with possible misalignment

libblkid/src/topology/topology.c

@@ -222,14 +222,13 @@ static int topology_set_value(blkid_probe pr, const char *name,
 		return 0;	/* ignore zeros */
 
 	if (chn->binary) {
-		unsigned long *v =
-			(unsigned long *) (chn->data + structoff);
-		*v = data;
+		memcpy(chn->data + structoff, &data, sizeof(data));
 		return 0;
 	}
 	return blkid_probe_sprintf_value(pr, name, "%llu", data);
 }
 
+
 /* the topology info is complete when we have at least "minimum_io_size" which
  * is provided by all blkid topology drivers */
 static int topology_is_complete(blkid_probe pr)