diff options
| author | Tom Lane <tgl@sss.pgh.pa.us> | 2018-12-10 11:12:43 -0500 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2018-12-10 11:12:43 -0500 |
| commit | e60122b54daf6f0e93162161b41ecb9ab4655fa5 (patch) | |
| tree | 5db10e020194c4ec6108f2d44d0c1dbd146be086 | |
| parent | 9eaba23c414d9da1e767e1af0a80cb687dc358e2 (diff) | |
Add stack depth checks to key recursive functions in backend/nodes/*.c.
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
| -rw-r--r-- | src/backend/nodes/equalfuncs.c | 4 | ||||
| -rw-r--r-- | src/backend/nodes/nodeFuncs.c | 3 | ||||
| -rw-r--r-- | src/backend/nodes/outfuncs.c | 4 | ||||
| -rw-r--r-- | src/backend/nodes/readfuncs.c | 4 |
4 files changed, 15 insertions, 0 deletions
diff --git a/src/backend/nodes/equalfuncs.c b/src/backend/nodes/equalfuncs.c index c5bb817ba19..c566eb9b257 100644 --- a/src/backend/nodes/equalfuncs.c +++ b/src/backend/nodes/equalfuncs.c @@ -29,6 +29,7 @@ #include "postgres.h" +#include "miscadmin.h" #include "nodes/extensible.h" #include "nodes/relation.h" #include "utils/datum.h" @@ -2978,6 +2979,9 @@ 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)) { /* diff --git a/src/backend/nodes/nodeFuncs.c b/src/backend/nodes/nodeFuncs.c index e3eb0c57887..ba119a2e596 100644 --- a/src/backend/nodes/nodeFuncs.c +++ b/src/backend/nodes/nodeFuncs.c @@ -3701,6 +3701,9 @@ 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; diff --git a/src/backend/nodes/outfuncs.c b/src/backend/nodes/outfuncs.c index 95d6abb93e6..ec4d4b220cd 100644 --- a/src/backend/nodes/outfuncs.c +++ b/src/backend/nodes/outfuncs.c @@ -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" @@ -3615,6 +3616,9 @@ _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)) diff --git a/src/backend/nodes/readfuncs.c b/src/backend/nodes/readfuncs.c index cd426638c51..38cd03ddf01 100644 --- a/src/backend/nodes/readfuncs.c +++ b/src/backend/nodes/readfuncs.c @@ -29,6 +29,7 @@ #include <math.h> #include "fmgr.h" +#include "miscadmin.h" #include "nodes/extensible.h" #include "nodes/parsenodes.h" #include "nodes/plannodes.h" @@ -2452,6 +2453,9 @@ 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) \ |