Check for BuildIndexValueDescription returning NULL in gist_page_items

Per Coverity. BuildIndexValueDescription() cannot actually return NULL in
this instance, because it only returns NULL if the user doesn't have the
required privileges, and this function can only be used by superuser. But
better safe than sorry.

1 files changed, 9 insertions, 3 deletions

diff --git a/contrib/pageinspect/gistfuncs.c b/contrib/pageinspect/gistfuncs.c
index 6e1ea04b346..d5da1ea839a 100644
--- a/contrib/pageinspect/gistfuncs.c
+++ b/contrib/pageinspect/gistfuncs.c
@@ -247,14 +247,20 @@ gist_page_items(PG_FUNCTION_ARGS)
 		index_deform_tuple(itup, RelationGetDescr(indexRel),
 						   itup_values, itup_isnull);
 
-		key_desc = BuildIndexValueDescription(indexRel, itup_values, itup_isnull);
-
 		memset(nulls, 0, sizeof(nulls));
 
 		values[0] = DatumGetInt16(offset);
 		values[1] = ItemPointerGetDatum(&itup->t_tid);
 		values[2] = Int32GetDatum((int) IndexTupleSize(itup));
-		values[3] = CStringGetTextDatum(key_desc);
+
+		key_desc = BuildIndexValueDescription(indexRel, itup_values, itup_isnull);
+		if (key_desc)
+			values[3] = CStringGetTextDatum(key_desc);
+		else
+		{
+			values[3] = (Datum) 0;
+			nulls[3] = true;
+		}
 
 		tuplestore_putvalues(tupstore, tupdesc, values, nulls);
 	}