Index: trunk/i386/libsaio/device_tree.c
===================================================================
--- trunk/i386/libsaio/device_tree.c	(revision 2615)
+++ trunk/i386/libsaio/device_tree.c	(revision 2616)
@@ -353,6 +353,11 @@
 			{
 				buf = *buffer_p;
 			}
+			if (!buf)
+			{
+				*length = 0;
+				return;
+			}
 
 			bzero(buf, totalSize);