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Only allow returning string types or bytea from json_serialize

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These are documented to be the allowed types for the RETURNING clause,
but the restriction was not being enforced, which caused a segfault if
another type was specified. Add some testing for this.

Per report from a.kozhemyakin

Backpatch to release 15.
This commit is contained in:
Andrew Dunstan 2022-07-07 17:40:02 -04:00
parent 8821054210
commit 3c633f32b9
3 changed files with 32 additions and 0 deletions
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17
src/backend/parser/parse_expr.c
View File

@ -4574,7 +4574,24 @@ transformJsonSerializeExpr(ParseState *pstate, JsonSerializeExpr *expr)
JsonReturning *returning;
if (expr->output)
{
returning = transformJsonOutput(pstate, expr->output, true);
if (returning->typid != BYTEAOID)
{
char typcategory;
bool typispreferred;
get_type_category_preferred(returning->typid, &typcategory,
&typispreferred);
if (typcategory != TYPCATEGORY_STRING)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("cannot use RETURNING type %s in JSON_SERIALIZE",
format_type_be(returning->typid)),
errhint("Try returning a string type or bytea")));
}
}
else
{
/* RETURNING TEXT FORMAT JSON is by default */

10
src/test/regress/expected/sqljson.out
View File

@ -302,12 +302,22 @@ SELECT JSON_SERIALIZE('{ "a" : 1 } ' RETURNING bytea);
\x7b20226122203a2031207d20
(1 row)
SELECT JSON_SERIALIZE('{ "a" : 1 } ' RETURNING varchar);
json_serialize
----------------
{ "a" : 1 }
(1 row)
SELECT pg_typeof(JSON_SERIALIZE(NULL));
pg_typeof
-----------
text
(1 row)
-- only string types or bytea allowed
SELECT JSON_SERIALIZE('{ "a" : 1 } ' RETURNING jsonb);
ERROR: cannot use RETURNING type jsonb in JSON_SERIALIZE
HINT: Try returning a string type or bytea
EXPLAIN (VERBOSE, COSTS OFF) SELECT JSON_SERIALIZE('{}');
QUERY PLAN
-----------------------------------------------------

5
src/test/regress/sql/sqljson.sql
View File

@ -60,8 +60,13 @@ SELECT JSON_SERIALIZE('{ "a" : 1 } ');
SELECT JSON_SERIALIZE('1');
SELECT JSON_SERIALIZE('1' FORMAT JSON);
SELECT JSON_SERIALIZE('{ "a" : 1 } ' RETURNING bytea);
SELECT JSON_SERIALIZE('{ "a" : 1 } ' RETURNING varchar);
SELECT pg_typeof(JSON_SERIALIZE(NULL));
-- only string types or bytea allowed
SELECT JSON_SERIALIZE('{ "a" : 1 } ' RETURNING jsonb);
EXPLAIN (VERBOSE, COSTS OFF) SELECT JSON_SERIALIZE('{}');
EXPLAIN (VERBOSE, COSTS OFF) SELECT JSON_SERIALIZE('{}' RETURNING bytea);