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Add stack depth checks to key recursive functions in backend/nodes/*.c.

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Although copyfuncs.c has a check_stack_depth call in its recursion,
equalfuncs.c, outfuncs.c, and readfuncs.c lacked one.  This seems
unwise.

Likewise fix planstate_tree_walker(), in branches where that exists.

Discussion: https://postgr.es/m/30253.1544286631@sss.pgh.pa.us
This commit is contained in:
Tom Lane
2018-12-10 11:12:43 -05:00
parent e28649a67f
commit 001bb9f3ed
4 changed files with 15 additions and 0 deletions
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4
src/backend/nodes/equalfuncs.c
View File

@@ -29,6 +29,7 @@
#include "postgres.h"
#include "miscadmin.h"
#include "nodes/extensible.h"
#include "nodes/relation.h"
#include "utils/datum.h"
@@ -3002,6 +3003,9 @@ equal(const void *a, const void *b)
if (nodeTag(a) != nodeTag(b))
return false;
/* Guard against stack overflow due to overly complex expressions */
check_stack_depth();
switch (nodeTag(a))
{
/*

3
src/backend/nodes/nodeFuncs.c
View File

@@ -3726,6 +3726,9 @@ planstate_tree_walker(PlanState *planstate,
Plan *plan = planstate->plan;
ListCell *lc;
/* Guard against stack overflow due to overly complex plan trees */
check_stack_depth();
/* initPlan-s */
if (planstate_walk_subplans(planstate->initPlan, walker, context))
return true;

4
src/backend/nodes/outfuncs.c
View File

@@ -30,6 +30,7 @@
#include <ctype.h>
#include "lib/stringinfo.h"
#include "miscadmin.h"
#include "nodes/extensible.h"
#include "nodes/plannodes.h"
#include "nodes/relation.h"
@@ -3701,6 +3702,9 @@ _outPartitionRangeDatum(StringInfo str, const PartitionRangeDatum *node)
void
outNode(StringInfo str, const void *obj)
{
/* Guard against stack overflow due to overly complex expressions */
check_stack_depth();
if (obj == NULL)
appendStringInfoString(str, "<>");
else if (IsA(obj, List) ||IsA(obj, IntList) || IsA(obj, OidList))

4
src/backend/nodes/readfuncs.c
View File

@@ -33,6 +33,7 @@
#include <math.h>
#include "fmgr.h"
#include "miscadmin.h"
#include "nodes/extensible.h"
#include "nodes/parsenodes.h"
#include "nodes/plannodes.h"
@@ -2549,6 +2550,9 @@ parseNodeString(void)
READ_TEMP_LOCALS();
/* Guard against stack overflow due to overly complex expressions */
check_stack_depth();
token = pg_strtok(&length);
#define MATCH(tokname, namelen) \