Index: uspace/lib/block/libblock.c
===================================================================
--- uspace/lib/block/libblock.c	(revision ffa2c8ef45390c01f3f4be4827bcd41c32f7951c)
+++ uspace/lib/block/libblock.c	(revision 37cf3792b1b6950b2aeaeaadff78ffa6fe8c5fc9)
@@ -294,6 +294,8 @@
 
 	/* Allow 1:1 or small-to-large block size translation */
-	if (cache->lblock_size % devcon->pblock_size != 0)
+	if (cache->lblock_size % devcon->pblock_size != 0) {
+		free(cache);
 		return ENOTSUP;
+	}
 
 	cache->blocks_cluster = cache->lblock_size / devcon->pblock_size;