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_SPI_execute_plan failed to return result tuple table to caller in

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the ProcessUtility case, resulting in an intratransaction memory leak
if a utility command actually did return any tuples, as reported by
Dmitry Karasik.  Fix this and also make the behavior more consistent
for cases involving nested SPI operations and multiple query trees,
by ensuring that we store the state locally until it is ready to be
returned to the caller.
REL8_1_STABLE
Tom Lane 21 years ago
parent ca8cfc9846
commit 1b61ee3c69
2 changed files with 43 additions and 33 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
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  1. 71
      src/backend/executor/spi.c
  2. 5
      src/include/executor/spi_priv.h

71
src/backend/executor/spi.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/executor/spi.c,v 1.141 2005/06/09 21:25:22 tgl Exp $
* $PostgreSQL: pgsql/src/backend/executor/spi.c,v 1.142 2005/10/01 18:43:19 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -104,6 +104,7 @@ SPI_connect(void)
_SPI_current = &(_SPI_stack[_SPI_connected]);
_SPI_current->processed = 0;
_SPI_current->lastoid = InvalidOid;
_SPI_current->tuptable = NULL;
_SPI_current->procCxt = NULL; /* in case we fail to create 'em */
_SPI_current->execCxt = NULL;
@ -859,7 +860,7 @@ SPI_cursor_open(const char *name, void *plan,
break;
}
/* Reset SPI result */
/* Reset SPI result (note we deliberately don't touch lastoid) */
SPI_processed = 0;
SPI_tuptable = NULL;
_SPI_current->processed = 0;
@ -1313,6 +1314,9 @@ _SPI_execute_plan(_SPI_plan *plan, Datum *Values, const char *Nulls,
bool read_only, long tcount)
{
volatile int res = 0;
volatile uint32 my_processed = 0;
volatile Oid my_lastoid = InvalidOid;
SPITupleTable * volatile my_tuptable = NULL;
Snapshot saveActiveSnapshot;
/* Be sure to restore ActiveSnapshot on error exit */
@ -1347,12 +1351,6 @@ _SPI_execute_plan(_SPI_plan *plan, Datum *Values, const char *Nulls,
else
paramLI = NULL;
/* Reset state (only needed in case string is empty) */
SPI_processed = 0;
SPI_lastoid = InvalidOid;
SPI_tuptable = NULL;
_SPI_current->tuptable = NULL;
/*
* Setup error traceback support for ereport()
*/
@ -1366,13 +1364,6 @@ _SPI_execute_plan(_SPI_plan *plan, Datum *Values, const char *Nulls,
List *query_list = lfirst(query_list_list_item);
ListCell *query_list_item;
/* Reset state for each original parsetree */
/* (at most one of its querytrees will be marked canSetTag) */
SPI_processed = 0;
SPI_lastoid = InvalidOid;
SPI_tuptable = NULL;
_SPI_current->tuptable = NULL;
foreach(query_list_item, query_list)
{
Query *queryTree = (Query *) lfirst(query_list_item);
@ -1383,6 +1374,10 @@ _SPI_execute_plan(_SPI_plan *plan, Datum *Values, const char *Nulls,
planTree = lfirst(plan_list_item);
plan_list_item = lnext(plan_list_item);
_SPI_current->processed = 0;
_SPI_current->lastoid = InvalidOid;
_SPI_current->tuptable = NULL;
if (queryTree->commandType == CMD_UTILITY)
{
if (IsA(queryTree->utilityStmt, CopyStmt))
@ -1467,6 +1462,23 @@ _SPI_execute_plan(_SPI_plan *plan, Datum *Values, const char *Nulls,
}
FreeSnapshot(ActiveSnapshot);
ActiveSnapshot = NULL;
/*
* The last canSetTag query sets the auxiliary values returned
* to the caller. Be careful to free any tuptables not
* returned, to avoid intratransaction memory leak.
*/
if (queryTree->canSetTag)
{
my_processed = _SPI_current->processed;
my_lastoid = _SPI_current->lastoid;
SPI_freetuptable(my_tuptable);
my_tuptable = _SPI_current->tuptable;
}
else
{
SPI_freetuptable(_SPI_current->tuptable);
_SPI_current->tuptable = NULL;
}
/* we know that the receiver doesn't need a destroy call */
if (res < 0)
goto fail;
@ -1490,6 +1502,11 @@ fail:
ActiveSnapshot = saveActiveSnapshot;
/* Save results for caller */
SPI_processed = my_processed;
SPI_lastoid = my_lastoid;
SPI_tuptable = my_tuptable;
return res;
}
@ -1497,9 +1514,7 @@ static int
_SPI_pquery(QueryDesc *queryDesc, long tcount)
{
int operation = queryDesc->operation;
CommandDest origDest = queryDesc->dest->mydest;
int res;
Oid save_lastoid;
switch (operation)
{
@ -1510,6 +1525,11 @@ _SPI_pquery(QueryDesc *queryDesc, long tcount)
res = SPI_OK_SELINTO;
queryDesc->dest = None_Receiver; /* don't output results */
}
else if (queryDesc->dest->mydest != SPI)
{
/* Don't return SPI_OK_SELECT if we're discarding result */
res = SPI_OK_UTILITY;
}
break;
case CMD_INSERT:
res = SPI_OK_INSERT;
@ -1536,7 +1556,7 @@ _SPI_pquery(QueryDesc *queryDesc, long tcount)
ExecutorRun(queryDesc, ForwardScanDirection, tcount);
_SPI_current->processed = queryDesc->estate->es_processed;
save_lastoid = queryDesc->estate->es_lastoid;
_SPI_current->lastoid = queryDesc->estate->es_lastoid;
if (operation == CMD_SELECT && queryDesc->dest->mydest == SPI)
{
@ -1549,19 +1569,6 @@ _SPI_pquery(QueryDesc *queryDesc, long tcount)
ExecutorEnd(queryDesc);
/* Test origDest here so that SPI_processed gets set in SELINTO case */
if (origDest == SPI)
{
SPI_processed = _SPI_current->processed;
SPI_lastoid = save_lastoid;
SPI_tuptable = _SPI_current->tuptable;
}
else if (res == SPI_OK_SELECT)
{
/* Don't return SPI_OK_SELECT if we discarded the result */
res = SPI_OK_UTILITY;
}
#ifdef SPI_EXECUTOR_STATS
if (ShowExecutorStats)
ShowUsage("SPI EXECUTOR STATS");
@ -1615,7 +1622,7 @@ _SPI_cursor_operation(Portal portal, bool forward, long count,
if (_SPI_begin_call(true) < 0)
elog(ERROR, "SPI cursor operation called while not connected");
/* Reset the SPI result */
/* Reset the SPI result (note we deliberately don't touch lastoid) */
SPI_processed = 0;
SPI_tuptable = NULL;
_SPI_current->processed = 0;

5
src/include/executor/spi_priv.h
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@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/executor/spi_priv.h,v 1.22 2004/12/31 22:03:29 pgsql Exp $
* $PostgreSQL: pgsql/src/include/executor/spi_priv.h,v 1.23 2005/10/01 18:43:19 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -18,8 +18,11 @@
typedef struct
{
/* current results */
uint32 processed; /* by Executor */
Oid lastoid;
SPITupleTable *tuptable;
MemoryContext procCxt; /* procedure context */
MemoryContext execCxt; /* executor context */
MemoryContext savedcxt;

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