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Fix crash in json_to_record().

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json_to_record() depends on get_call_result_type() for the tuple
descriptor of the record that should be returned, but in some cases
that cannot be determined. Add a guard to check if the tuple
descriptor has been properly resolved, similar to other callers of
get_call_result_type().

Also add guard for two other callers of get_call_result_type() in
jsonfuncs.c. Although json_to_record() is the only actual bug, it's a
good idea to follow convention.
This commit is contained in:
Jeff Davis 2014-02-26 07:47:09 -08:00
parent fccebe421d
commit 486ea0b19e
1 changed files with 17 additions and 3 deletions
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20
src/backend/utils/adt/jsonfuncs.c
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@ -941,7 +941,11 @@ each_worker(PG_FUNCTION_ARGS, bool as_text)
rsi->returnMode = SFRM_Materialize;
(void) get_call_result_type(fcinfo, NULL, &tupdesc);
if (get_call_result_type(fcinfo, NULL, &tupdesc) != TYPEFUNC_COMPOSITE)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("function returning record called in context "
"that cannot accept type record")));
/* make these in a sufficiently long-lived memory context */
old_cxt = MemoryContextSwitchTo(rsi->econtext->ecxt_per_query_memory);
@ -1349,7 +1353,13 @@ populate_record_worker(PG_FUNCTION_ARGS, bool have_record_arg)
json = PG_GETARG_TEXT_P(0);
get_call_result_type(fcinfo, NULL, &tupdesc);
if (get_call_result_type(fcinfo, NULL, &tupdesc) != TYPEFUNC_COMPOSITE)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("function returning record called in context "
"that cannot accept type record"),
errhint("Try calling the function in the FROM clause "
"using a column definition list.")));
}
json_hash = get_json_object_as_hash(json, "json_populate_record",
@ -1713,7 +1723,11 @@ populate_recordset_worker(PG_FUNCTION_ARGS, bool have_record_arg)
* get the tupdesc from the result set info - it must be a record type
* because we already checked that arg1 is a record type.
*/
(void) get_call_result_type(fcinfo, NULL, &tupdesc);
if (get_call_result_type(fcinfo, NULL, &tupdesc) != TYPEFUNC_COMPOSITE)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("function returning record called in context "
"that cannot accept type record")));
state = palloc0(sizeof(PopulateRecordsetState));
sem = palloc0(sizeof(JsonSemAction));