Index: uspace/lib/block/libblock.c
===================================================================
--- uspace/lib/block/libblock.c	(revision b9e6205e7b7cc2992d7a83035b70b45859c6bfc9)
+++ uspace/lib/block/libblock.c	(revision 0dfaa099a12cf0db2564585eada36845dc3a6e97)
@@ -438,4 +438,5 @@
 			if (!b->data) {
 				free(b);
+				b = NULL;
 				goto recycle;
 			}