diff --git a/contrib/ltree/ltree_io.c b/contrib/ltree/ltree_io.c
index a6cb357d27bc55415edba2562548090e82e5f06c..ecc926efba06a8ce924c13415e864e33a536270e 100644
--- a/contrib/ltree/ltree_io.c
+++ b/contrib/ltree/ltree_io.c
@@ -1,7 +1,7 @@
 /*
  * in/out function for ltree and lquery
  * Teodor Sigaev <teodor@stack.net>
- * $PostgreSQL: pgsql/contrib/ltree/ltree_io.c,v 1.14 2007/02/28 22:44:38 tgl Exp $
+ * $PostgreSQL: pgsql/contrib/ltree/ltree_io.c,v 1.14.2.1 2008/04/11 22:52:17 tgl Exp $
  */
 
 #include "ltree.h"
@@ -118,7 +118,7 @@ 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);
 	SET_VARSIZE(result, LTREE_HDRSIZE + totallen);
 	result->numlevel = lptr - list;
 	curlevel = LTREE_FIRST(result);
@@ -208,8 +208,7 @@ 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)
 	{
@@ -448,7 +447,7 @@ lquery_in(PG_FUNCTION_ARGS)
 		curqlevel = NEXTLEV(curqlevel);
 	}
 
-	result = (lquery *) palloc(totallen);
+	result = (lquery *) palloc0(totallen);
 	SET_VARSIZE(result, totallen);
 	result->numlevel = num;
 	result->firstgood = 0;
diff --git a/src/backend/utils/adt/arrayfuncs.c b/src/backend/utils/adt/arrayfuncs.c
index 8b058cb422fc002156cb1e7f52efa89d7ca9ad45..c8da7c4d9476b97f84ed3b59284e11f3c92ca6bf 100644
--- a/src/backend/utils/adt/arrayfuncs.c
+++ b/src/backend/utils/adt/arrayfuncs.c
@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/utils/adt/arrayfuncs.c,v 1.140 2008/01/01 19:45:52 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/backend/utils/adt/arrayfuncs.c,v 1.140.2.1 2008/04/11 22:52:17 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -319,7 +319,7 @@ array_in(PG_FUNCTION_ARGS)
 		dataoffset = 0;			/* marker for no null bitmap */
 		nbytes += ARR_OVERHEAD_NONULLS(ndim);
 	}
-	retval = (ArrayType *) palloc(nbytes);
+	retval = (ArrayType *) palloc0(nbytes);
 	SET_VARSIZE(retval, nbytes);
 	retval->ndim = ndim;
 	retval->dataoffset = dataoffset;
diff --git a/src/backend/utils/adt/geo_ops.c b/src/backend/utils/adt/geo_ops.c
index 4bc4d19eae49eac39cacf7938d54531935366b9b..10963190f6d35a7576730730d50d9b1fba00ee60 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 1.99 2008/01/01 19:45:52 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/backend/utils/adt/geo_ops.c,v 1.99.2.1 2008/04/11 22:52:17 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);
 }
diff --git a/src/backend/utils/adt/tsquery.c b/src/backend/utils/adt/tsquery.c
index 41863fb5db54162d9ee213e2c6c47dc8d75aa9db..4b0425965f3f787804d7057029038ace547a8867 100644
--- a/src/backend/utils/adt/tsquery.c
+++ b/src/backend/utils/adt/tsquery.c
@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/utils/adt/tsquery.c,v 1.15 2008/01/08 01:04:08 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/utils/adt/tsquery.c,v 1.15.2.1 2008/04/11 22:52:17 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -222,7 +222,7 @@ pushOperator(TSQueryParserState state, int8 oper)
 
 	Assert(oper == OP_NOT || oper == OP_AND || oper == OP_OR);
 
-	tmp = (QueryOperator *) palloc(sizeof(QueryOperator));
+	tmp = (QueryOperator *) palloc0(sizeof(QueryOperator));
 	tmp->type = QI_OPR;
 	tmp->oper = oper;
 	/* left is filled in later with findoprnd */
@@ -246,7 +246,7 @@ pushValue_internal(TSQueryParserState state, pg_crc32 valcrc, int distance, int
 				 errmsg("operand is too long in tsquery: \"%s\"",
 						state->buffer)));
 
-	tmp = (QueryOperand *) palloc(sizeof(QueryOperand));
+	tmp = (QueryOperand *) palloc0(sizeof(QueryOperand));
 	tmp->type = QI_VAL;
 	tmp->weight = weight;
 	tmp->valcrc = (int32) valcrc;
@@ -303,7 +303,7 @@ pushStop(TSQueryParserState state)
 {
 	QueryOperand *tmp;
 
-	tmp = (QueryOperand *) palloc(sizeof(QueryOperand));
+	tmp = (QueryOperand *) palloc0(sizeof(QueryOperand));
 	tmp->type = QI_VALSTOP;
 
 	state->polstr = lcons(tmp, state->polstr);