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Fix copy-paste error in datum_to_jsonb_internal()

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Commit 3c152a27b06 mistakenly repeated JSONTYPE_JSON in a condition,
omitting JSONTYPE_CAST. As a result, datum_to_jsonb_internal() failed
to reject inputs that were casts (e.g., from an enum to json as in the
example below) when used as keys in JSON constructors.

This led to a crash in cases like:

  SELECT JSON_OBJECT('happy'::mood: '123'::jsonb);

where 'happy'::mood is implicitly cast to json. The missing check
meant such casted values weren’t properly rejected as invalid
(non-scalar) JSON keys.

Reported-by: Maciek Sakrejda <maciek@pganalyze.com>
Reviewed-by: Tender Wang <tndrwang@gmail.com>
Reviewed-by: Alvaro Herrera <alvherre@alvh.no-ip.org>
Reviewed-by: Maciek Sakrejda <maciek@pganalyze.com>
Discussion: https://postgr.es/m/CADXhmgTJtJZK9A3Na_ry+Xrq-ghjcejBRhcRMzWZvbd__QdgJA@mail.gmail.com
Backpatch-through: 17
This commit is contained in:
Amit Langote 2025-03-13 09:56:49 +09:00
parent e731e9d5ee
commit 8b2392ae3d
3 changed files with 24 additions and 1 deletions
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2
src/backend/utils/adt/jsonb.c
View File

@ -657,7 +657,7 @@ datum_to_jsonb_internal(Datum val, bool is_null, JsonbInState *result,
tcategory == JSONTYPE_COMPOSITE ||
tcategory == JSONTYPE_JSON ||
tcategory == JSONTYPE_JSONB ||
tcategory == JSONTYPE_JSON))
tcategory == JSONTYPE_CAST))
{
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),

12
src/test/regress/expected/sqljson.out
View File

@ -571,6 +571,18 @@ SELECT JSON_OBJECT(1: 1, '2': NULL, '3': 1, 4: NULL, '5': 'a' ABSENT ON NULL WIT
{"1": 1, "3": 1, "5": "a"}
(1 row)
-- BUG: https://postgr.es/m/CADXhmgTJtJZK9A3Na_ry%2BXrq-ghjcejBRhcRMzWZvbd__QdgJA%40mail.gmail.com
-- datum_to_jsonb_internal() didn't catch keys that are casts instead of a simple scalar
CREATE TYPE mood AS ENUM ('happy', 'sad', 'neutral');
CREATE FUNCTION mood_to_json(mood) RETURNS json AS $$
SELECT to_json($1::text);
$$ LANGUAGE sql IMMUTABLE;
CREATE CAST (mood AS json) WITH FUNCTION mood_to_json(mood) AS IMPLICIT;
SELECT JSON_OBJECT('happy'::mood: '123'::jsonb);
ERROR: key value must be scalar, not array, composite, or json
DROP CAST (mood AS json);
DROP FUNCTION mood_to_json;
DROP TYPE mood;
-- JSON_ARRAY()
SELECT JSON_ARRAY();
json_array

11
src/test/regress/sql/sqljson.sql
View File

@ -152,6 +152,17 @@ SELECT JSON_OBJECT(1: 1, '2': NULL, '1': 1 ABSENT ON NULL WITH UNIQUE RETURNING
SELECT JSON_OBJECT(1: 1, '2': NULL, '1': 1 ABSENT ON NULL WITHOUT UNIQUE RETURNING jsonb);
SELECT JSON_OBJECT(1: 1, '2': NULL, '3': 1, 4: NULL, '5': 'a' ABSENT ON NULL WITH UNIQUE RETURNING jsonb);
-- BUG: https://postgr.es/m/CADXhmgTJtJZK9A3Na_ry%2BXrq-ghjcejBRhcRMzWZvbd__QdgJA%40mail.gmail.com
-- datum_to_jsonb_internal() didn't catch keys that are casts instead of a simple scalar
CREATE TYPE mood AS ENUM ('happy', 'sad', 'neutral');
CREATE FUNCTION mood_to_json(mood) RETURNS json AS $$
SELECT to_json($1::text);
$$ LANGUAGE sql IMMUTABLE;
CREATE CAST (mood AS json) WITH FUNCTION mood_to_json(mood) AS IMPLICIT;
SELECT JSON_OBJECT('happy'::mood: '123'::jsonb);
DROP CAST (mood AS json);
DROP FUNCTION mood_to_json;
DROP TYPE mood;
-- JSON_ARRAY()
SELECT JSON_ARRAY();