Fix bug with multiple evaluation of tsearch2 compatibility trigger, trigger

data should be restored.
Backpatch only for 8.3 because previous versions haven't such layer.

1 files changed, 14 insertions, 2 deletions

diff --git a/contrib/tsearch2/tsearch2.c b/contrib/tsearch2/tsearch2.c
index 4e127264eb..db59331ab7 100644
--- a/contrib/tsearch2/tsearch2.c
+++ b/contrib/tsearch2/tsearch2.c
@@ -367,8 +367,10 @@ tsa_tsearch2(PG_FUNCTION_ARGS)
 {
 	TriggerData *trigdata;
 	Trigger    *trigger;
-	char	  **tgargs;
+	char	  **tgargs, 
+			  **tgargs_old;
 	int			i;
+	Datum		res;
 
 	/* Check call context */
 	if (!CALLED_AS_TRIGGER(fcinfo))		/* internal error */
@@ -388,10 +390,20 @@ tsa_tsearch2(PG_FUNCTION_ARGS)
 
 	tgargs[1] = pstrdup(GetConfigOptionByName("default_text_search_config",
 											  NULL));
+	tgargs_old = trigger->tgargs;
 	trigger->tgargs = tgargs;
 	trigger->tgnargs++;
 
-	return tsvector_update_trigger_byid(fcinfo);
+	res = tsvector_update_trigger_byid(fcinfo);
+
+	/* restore old trigger data */
+	trigger->tgargs = tgargs_old;
+	trigger->tgnargs--;
+
+	pfree(tgargs[1]);
+	pfree(tgargs);
+
+	return res;
 }