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Add safety check on expression nesting depth. Default value is set by

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a config.h #define, and the runtime value can be controlled via SET.
This commit is contained in:
Tom Lane
2000-03-17 05:29:07 +00:00
parent 341b328b18
commit 0e314d747e
7 changed files with 143 additions and 37 deletions
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48
src/backend/commands/variable.c
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@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/commands/variable.c,v 1.31 2000/02/27 21:10:41 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/commands/variable.c,v 1.32 2000/03/17 05:29:04 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -25,6 +25,7 @@
#include "miscadmin.h"
#include "optimizer/cost.h"
#include "optimizer/paths.h"
#include "parser/parse_expr.h"
#include "utils/builtins.h"
#include "utils/tqual.h"
#include "utils/trace.h"
@ -86,6 +87,9 @@ static bool parse_geqo(char *);
static bool show_ksqo(void);
static bool reset_ksqo(void);
static bool parse_ksqo(char *);
static bool reset_max_expr_depth(void);
static bool show_max_expr_depth(void);
static bool parse_max_expr_depth(char *);
static bool show_XactIsoLevel(void);
static bool reset_XactIsoLevel(void);
static bool parse_XactIsoLevel(char *);
@ -935,6 +939,44 @@ reset_ksqo()
return TRUE;
}
/*
* MAX_EXPR_DEPTH
*/
static bool
parse_max_expr_depth(char *value)
{
int newval;
if (value == NULL)
{
reset_max_expr_depth();
return TRUE;
}
newval = pg_atoi(value, sizeof(int), '\0');
if (newval < 10) /* somewhat arbitrary limit */
elog(ERROR, "Bad value for MAX_EXPR_DEPTH (%s)", value);
max_expr_depth = newval;
return TRUE;
}
static bool
show_max_expr_depth()
{
elog(NOTICE, "MAX_EXPR_DEPTH is %d", max_expr_depth);
return TRUE;
}
static bool
reset_max_expr_depth(void)
{
max_expr_depth = DEFAULT_MAX_EXPR_DEPTH;
return TRUE;
}
/* SET TRANSACTION */
static bool
@ -1103,6 +1145,10 @@ static struct VariableParsers
{
"ksqo", parse_ksqo, show_ksqo, reset_ksqo
},
{
"max_expr_depth", parse_max_expr_depth,
show_max_expr_depth, reset_max_expr_depth
},
{
"XactIsoLevel", parse_XactIsoLevel, show_XactIsoLevel, reset_XactIsoLevel
},