diff --git a/contrib/ltree/ltree_io.c b/contrib/ltree/ltree_io.c
index ccc6fc8ff7..8ef4ecf3f8 100644
--- a/contrib/ltree/ltree_io.c
+++ b/contrib/ltree/ltree_io.c
@@ -117,7 +117,7 @@ ltree_in(PG_FUNCTION_ARGS)
 				 errmsg("syntax error"),
 				 errdetail("Unexpected end of line.")));
 
-	result = (ltree *) palloc(LTREE_HDRSIZE + totallen);
+	result = (ltree *) palloc0(LTREE_HDRSIZE + totallen);
 	result->len = LTREE_HDRSIZE + totallen;
 	result->numlevel = lptr - list;
 	curlevel = LTREE_FIRST(result);
@@ -207,8 +207,7 @@ lquery_in(PG_FUNCTION_ARGS)
 	}
 
 	num++;
-	curqlevel = tmpql = (lquery_level *) palloc(ITEMSIZE * num);
-	memset((void *) tmpql, 0, ITEMSIZE * num);
+	curqlevel = tmpql = (lquery_level *) palloc0(ITEMSIZE * num);
 	ptr = buf;
 	while (*ptr)
 	{
@@ -447,7 +446,7 @@ lquery_in(PG_FUNCTION_ARGS)
 		curqlevel = NEXTLEV(curqlevel);
 	}
 
-	result = (lquery *) palloc(totallen);
+	result = (lquery *) palloc0(totallen);
 	result->len = totallen;
 	result->numlevel = num;
 	result->firstgood = 0;
diff --git a/src/backend/utils/adt/geo_ops.c b/src/backend/utils/adt/geo_ops.c
index 0efcfd6029..c29da3e568 100644
--- a/src/backend/utils/adt/geo_ops.c
+++ b/src/backend/utils/adt/geo_ops.c
@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/utils/adt/geo_ops.c,v 1.91.2.1 2007/12/18 00:04:22 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/utils/adt/geo_ops.c,v 1.91.2.2 2008/04/11 22:53:16 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -1425,6 +1425,8 @@ path_in(PG_FUNCTION_ARGS)
 				 errmsg("invalid input syntax for type path: \"%s\"", str)));
 
 	path->closed = (!isopen);
+	/* prevent instability in unused pad bytes */
+	path->dummy = 0;
 
 	PG_RETURN_PATH_P(path);
 }