From f8753d255d8ddd40d28ee4e006eec8fb57e71047 Mon Sep 17 00:00:00 2001 From: Richard Guo Date: Thu, 25 Jun 2026 16:30:50 +0900 Subject: [PATCH v2] plpython: Fix NULL pointer dereferences for broken sequence and mapping objects PL/Python and its hstore and jsonb transforms build SQL values from Python containers by calling Python C API functions that can return NULL, and in several places the result was used without first checking it. On the sequence side, PySequence_GetItem() is used when converting a returned sequence into a SQL array or composite value, when reading the argument list passed to plpy.execute() or plpy.cursor(), and when reading the list of type names given to plpy.prepare(). On the mapping side, the hstore and jsonb transforms call PyMapping_Size() and PyMapping_Items() and then index the result with PyList_GetItem() and PyTuple_GetItem(). All of these return NULL (or -1), with a Python exception set, for a broken object: for example one whose __getitem__() or items() raises, or which reports a length that disagrees with what it actually yields. The unchecked result was then dereferenced, crashing the backend. Fix this by checking the result of each call and reporting a regular error if it failed, so that the underlying Python exception is surfaced instead of taking down the session. --- .../expected/hstore_plpython.out | 65 ++++++++++++++ contrib/hstore_plpython/hstore_plpython.c | 16 ++++ .../hstore_plpython/sql/hstore_plpython.sql | 65 ++++++++++++++ .../expected/jsonb_plpython.out | 89 +++++++++++++++++++ contrib/jsonb_plpython/jsonb_plpython.c | 21 ++++- contrib/jsonb_plpython/sql/jsonb_plpython.sql | 77 ++++++++++++++++ .../plpython/expected/plpython_composite.out | 16 ++++ src/pl/plpython/expected/plpython_spi.out | 51 +++++++++++ src/pl/plpython/expected/plpython_types.out | 16 ++++ src/pl/plpython/plpy_cursorobject.c | 5 ++ src/pl/plpython/plpy_spi.c | 10 +++ src/pl/plpython/plpy_typeio.c | 9 +- src/pl/plpython/sql/plpython_composite.sql | 12 +++ src/pl/plpython/sql/plpython_spi.sql | 39 ++++++++ src/pl/plpython/sql/plpython_types.sql | 13 +++ 15 files changed, 500 insertions(+), 4 deletions(-) diff --git a/contrib/hstore_plpython/expected/hstore_plpython.out b/contrib/hstore_plpython/expected/hstore_plpython.out index 5fb56a2f65d..5f8315e84dd 100644 --- a/contrib/hstore_plpython/expected/hstore_plpython.out +++ b/contrib/hstore_plpython/expected/hstore_plpython.out @@ -43,6 +43,71 @@ SELECT test1bad(); ERROR: not a Python mapping CONTEXT: while creating return value PL/Python function "test1bad" +-- A mapping whose items() raises should be reported as an error, not crash +-- the backend +CREATE FUNCTION test1broken() RETURNS hstore +LANGUAGE plpython3u +TRANSFORM FOR TYPE hstore +AS $$ +class C(dict): + def items(self): + raise ValueError('items failed') +d = C() +d['x'] = 1 +return d +$$; +SELECT test1broken(); +ERROR: could not get items from Python mapping +CONTEXT: while creating return value +PL/Python function "test1broken" +-- Likewise for a mapping whose items() does not return key/value pairs +CREATE FUNCTION test1malformed() RETURNS hstore +LANGUAGE plpython3u +TRANSFORM FOR TYPE hstore +AS $$ +class C(dict): + def items(self): + return [42] +d = C() +d['x'] = 1 +return d +$$; +SELECT test1malformed(); +ERROR: items() of a Python mapping must return key/value pairs +CONTEXT: while creating return value +PL/Python function "test1malformed" +-- Likewise for a mapping whose items() yields fewer pairs than its length +CREATE FUNCTION test1short() RETURNS hstore +LANGUAGE plpython3u +TRANSFORM FOR TYPE hstore +AS $$ +class C(dict): + def items(self): + return [] +d = C() +d['x'] = 1 +return d +$$; +SELECT test1short(); +ERROR: items() of a Python mapping must return key/value pairs +CONTEXT: while creating return value +PL/Python function "test1short" +-- Likewise for a mapping whose __len__() raises +CREATE FUNCTION test1brokenlen() RETURNS hstore +LANGUAGE plpython3u +TRANSFORM FOR TYPE hstore +AS $$ +class C(dict): + def __len__(self): + raise ValueError('len failed') +d = C() +d['x'] = 1 +return d +$$; +SELECT test1brokenlen(); +ERROR: could not get size of Python mapping +CONTEXT: while creating return value +PL/Python function "test1brokenlen" -- test hstore[] -> python CREATE FUNCTION test1arr(val hstore[]) RETURNS int LANGUAGE plpython3u diff --git a/contrib/hstore_plpython/hstore_plpython.c b/contrib/hstore_plpython/hstore_plpython.c index f1e483980f4..b9d8b4537f7 100644 --- a/contrib/hstore_plpython/hstore_plpython.c +++ b/contrib/hstore_plpython/hstore_plpython.c @@ -143,7 +143,16 @@ plpython_to_hstore(PG_FUNCTION_ARGS) errmsg("not a Python mapping"))); pcount = PyMapping_Size(dict); + if (pcount < 0) + ereport(ERROR, + (errcode(ERRCODE_DATATYPE_MISMATCH), + errmsg("could not get size of Python mapping"))); + items = PyMapping_Items(dict); + if (items == NULL) + ereport(ERROR, + (errcode(ERRCODE_DATATYPE_MISMATCH), + errmsg("could not get items from Python mapping"))); PG_TRY(); { @@ -160,6 +169,13 @@ plpython_to_hstore(PG_FUNCTION_ARGS) PyObject *value; tuple = PyList_GetItem(items, i); + + /* The mapping's items() must yield key/value pairs */ + if (tuple == NULL || !PyTuple_Check(tuple) || PyTuple_Size(tuple) < 2) + ereport(ERROR, + (errcode(ERRCODE_DATATYPE_MISMATCH), + errmsg("items() of a Python mapping must return key/value pairs"))); + key = PyTuple_GetItem(tuple, 0); value = PyTuple_GetItem(tuple, 1); diff --git a/contrib/hstore_plpython/sql/hstore_plpython.sql b/contrib/hstore_plpython/sql/hstore_plpython.sql index ebd61e6c467..a2b2046380f 100644 --- a/contrib/hstore_plpython/sql/hstore_plpython.sql +++ b/contrib/hstore_plpython/sql/hstore_plpython.sql @@ -38,6 +38,71 @@ $$; SELECT test1bad(); +-- A mapping whose items() raises should be reported as an error, not crash +-- the backend +CREATE FUNCTION test1broken() RETURNS hstore +LANGUAGE plpython3u +TRANSFORM FOR TYPE hstore +AS $$ +class C(dict): + def items(self): + raise ValueError('items failed') +d = C() +d['x'] = 1 +return d +$$; + +SELECT test1broken(); + + +-- Likewise for a mapping whose items() does not return key/value pairs +CREATE FUNCTION test1malformed() RETURNS hstore +LANGUAGE plpython3u +TRANSFORM FOR TYPE hstore +AS $$ +class C(dict): + def items(self): + return [42] +d = C() +d['x'] = 1 +return d +$$; + +SELECT test1malformed(); + + +-- Likewise for a mapping whose items() yields fewer pairs than its length +CREATE FUNCTION test1short() RETURNS hstore +LANGUAGE plpython3u +TRANSFORM FOR TYPE hstore +AS $$ +class C(dict): + def items(self): + return [] +d = C() +d['x'] = 1 +return d +$$; + +SELECT test1short(); + + +-- Likewise for a mapping whose __len__() raises +CREATE FUNCTION test1brokenlen() RETURNS hstore +LANGUAGE plpython3u +TRANSFORM FOR TYPE hstore +AS $$ +class C(dict): + def __len__(self): + raise ValueError('len failed') +d = C() +d['x'] = 1 +return d +$$; + +SELECT test1brokenlen(); + + -- test hstore[] -> python CREATE FUNCTION test1arr(val hstore[]) RETURNS int LANGUAGE plpython3u diff --git a/contrib/jsonb_plpython/expected/jsonb_plpython.out b/contrib/jsonb_plpython/expected/jsonb_plpython.out index cac963de69c..8d3f5328809 100644 --- a/contrib/jsonb_plpython/expected/jsonb_plpython.out +++ b/contrib/jsonb_plpython/expected/jsonb_plpython.out @@ -304,3 +304,92 @@ SELECT test_dict1(); {"": 2, "a": 1, "33": 3} (1 row) +-- A custom sequence whose __getitem__ raises should be reported as an error, +-- not crash the backend +CREATE FUNCTION test_broken_sequence() RETURNS jsonb +LANGUAGE plpython3u +TRANSFORM FOR TYPE jsonb +AS $$ +class C: + def __len__(self): + return 2 + def __getitem__(self, i): + raise ValueError('getitem failed') +return C() +$$; +SELECT test_broken_sequence(); +ERROR: could not get element 0 from sequence +DETAIL: ValueError: getitem failed +CONTEXT: Traceback (most recent call last): +while creating return value +PL/Python function "test_broken_sequence" +-- A mapping whose items() raises should be reported as an error, not crash +-- the backend +CREATE FUNCTION test_broken_mapping() RETURNS jsonb +LANGUAGE plpython3u +TRANSFORM FOR TYPE jsonb +AS $$ +class C(dict): + def items(self): + raise ValueError('items failed') +d = C() +d['x'] = 1 +return d +$$; +SELECT test_broken_mapping(); +ERROR: could not get items from Python mapping +DETAIL: ValueError: items failed +CONTEXT: Traceback (most recent call last): +while creating return value +PL/Python function "test_broken_mapping" +-- Likewise for a mapping whose items() does not return key/value pairs +CREATE FUNCTION test_malformed_mapping() RETURNS jsonb +LANGUAGE plpython3u +TRANSFORM FOR TYPE jsonb +AS $$ +class C(dict): + def items(self): + return [42] +d = C() +d['x'] = 1 +return d +$$; +SELECT test_malformed_mapping(); +ERROR: items() of a Python mapping must return key/value pairs +CONTEXT: while creating return value +PL/Python function "test_malformed_mapping" +-- Likewise for a mapping whose items() yields fewer pairs than its length +CREATE FUNCTION test_short_mapping() RETURNS jsonb +LANGUAGE plpython3u +TRANSFORM FOR TYPE jsonb +AS $$ +class C(dict): + def items(self): + return [] +d = C() +d['x'] = 1 +return d +$$; +SELECT test_short_mapping(); +ERROR: items() of a Python mapping must return key/value pairs +DETAIL: IndexError: list index out of range +CONTEXT: while creating return value +PL/Python function "test_short_mapping" +-- Likewise for a mapping whose __len__() raises +CREATE FUNCTION test_broken_len_mapping() RETURNS jsonb +LANGUAGE plpython3u +TRANSFORM FOR TYPE jsonb +AS $$ +class C(dict): + def __len__(self): + raise ValueError('len failed') +d = C() +d['x'] = 1 +return d +$$; +SELECT test_broken_len_mapping(); +ERROR: could not get size of Python mapping +DETAIL: ValueError: len failed +CONTEXT: Traceback (most recent call last): +while creating return value +PL/Python function "test_broken_len_mapping" diff --git a/contrib/jsonb_plpython/jsonb_plpython.c b/contrib/jsonb_plpython/jsonb_plpython.c index 909612a6039..dc17c9ee570 100644 --- a/contrib/jsonb_plpython/jsonb_plpython.c +++ b/contrib/jsonb_plpython/jsonb_plpython.c @@ -274,7 +274,12 @@ PLyMapping_ToJsonbValue(PyObject *obj, JsonbInState *jsonb_state) PyObject *volatile items; pcount = PyMapping_Size(obj); + if (pcount < 0) + PLy_elog(ERROR, "could not get size of Python mapping"); + items = PyMapping_Items(obj); + if (items == NULL) + PLy_elog(ERROR, "could not get items from Python mapping"); PG_TRY(); { @@ -286,8 +291,15 @@ PLyMapping_ToJsonbValue(PyObject *obj, JsonbInState *jsonb_state) { JsonbValue jbvKey; PyObject *item = PyList_GetItem(items, i); - PyObject *key = PyTuple_GetItem(item, 0); - PyObject *value = PyTuple_GetItem(item, 1); + PyObject *key; + PyObject *value; + + /* The mapping's items() must yield key/value pairs */ + if (item == NULL || !PyTuple_Check(item) || PyTuple_Size(item) < 2) + PLy_elog(ERROR, "items() of a Python mapping must return key/value pairs"); + + key = PyTuple_GetItem(item, 0); + value = PyTuple_GetItem(item, 1); /* Python dictionary can have None as key */ if (key == Py_None) @@ -337,7 +349,10 @@ PLySequence_ToJsonbValue(PyObject *obj, JsonbInState *jsonb_state) for (i = 0; i < pcount; i++) { value = PySequence_GetItem(obj, i); - Assert(value); + + /* PySequence_GetItem() can return NULL, with an exception set */ + if (value == NULL) + PLy_elog(ERROR, "could not get element %d from sequence", (int) i); PLyObject_ToJsonbValue(value, jsonb_state, true); Py_XDECREF(value); diff --git a/contrib/jsonb_plpython/sql/jsonb_plpython.sql b/contrib/jsonb_plpython/sql/jsonb_plpython.sql index 29dc33279a0..fd8485c89c1 100644 --- a/contrib/jsonb_plpython/sql/jsonb_plpython.sql +++ b/contrib/jsonb_plpython/sql/jsonb_plpython.sql @@ -181,3 +181,80 @@ return x $$; SELECT test_dict1(); + +-- A custom sequence whose __getitem__ raises should be reported as an error, +-- not crash the backend +CREATE FUNCTION test_broken_sequence() RETURNS jsonb +LANGUAGE plpython3u +TRANSFORM FOR TYPE jsonb +AS $$ +class C: + def __len__(self): + return 2 + def __getitem__(self, i): + raise ValueError('getitem failed') +return C() +$$; + +SELECT test_broken_sequence(); + +-- A mapping whose items() raises should be reported as an error, not crash +-- the backend +CREATE FUNCTION test_broken_mapping() RETURNS jsonb +LANGUAGE plpython3u +TRANSFORM FOR TYPE jsonb +AS $$ +class C(dict): + def items(self): + raise ValueError('items failed') +d = C() +d['x'] = 1 +return d +$$; + +SELECT test_broken_mapping(); + +-- Likewise for a mapping whose items() does not return key/value pairs +CREATE FUNCTION test_malformed_mapping() RETURNS jsonb +LANGUAGE plpython3u +TRANSFORM FOR TYPE jsonb +AS $$ +class C(dict): + def items(self): + return [42] +d = C() +d['x'] = 1 +return d +$$; + +SELECT test_malformed_mapping(); + +-- Likewise for a mapping whose items() yields fewer pairs than its length +CREATE FUNCTION test_short_mapping() RETURNS jsonb +LANGUAGE plpython3u +TRANSFORM FOR TYPE jsonb +AS $$ +class C(dict): + def items(self): + return [] +d = C() +d['x'] = 1 +return d +$$; + +SELECT test_short_mapping(); + +-- Likewise for a mapping whose __len__() raises +CREATE FUNCTION test_broken_len_mapping() RETURNS jsonb +LANGUAGE plpython3u +TRANSFORM FOR TYPE jsonb +AS $$ +class C(dict): + def __len__(self): + raise ValueError('len failed') +d = C() +d['x'] = 1 +return d +$$; + +SELECT test_broken_len_mapping(); diff --git a/src/pl/plpython/expected/plpython_composite.out b/src/pl/plpython/expected/plpython_composite.out index 674af93ddcf..ffce7fc1be7 100644 --- a/src/pl/plpython/expected/plpython_composite.out +++ b/src/pl/plpython/expected/plpython_composite.out @@ -606,3 +606,19 @@ DETAIL: Missing left parenthesis. HINT: To return a composite type in an array, return the composite type as a Python tuple, e.g., "[('foo',)]". CONTEXT: while creating return value PL/Python function "composite_type_as_list_broken" +-- A custom sequence whose length matches the tuple but whose __getitem__ +-- raises should be reported as an error, not crash the backend. +CREATE FUNCTION composite_type_as_broken_sequence() RETURNS type_record AS $$ +class C: + def __len__(self): + return 2 + def __getitem__(self, i): + raise ValueError('getitem failed') +return C() +$$ LANGUAGE plpython3u; +SELECT * FROM composite_type_as_broken_sequence(); +ERROR: could not get element 0 from sequence +DETAIL: ValueError: getitem failed +CONTEXT: Traceback (most recent call last): +while creating return value +PL/Python function "composite_type_as_broken_sequence" diff --git a/src/pl/plpython/expected/plpython_spi.out b/src/pl/plpython/expected/plpython_spi.out index b572f9bf73b..0320ff01f6b 100644 --- a/src/pl/plpython/expected/plpython_spi.out +++ b/src/pl/plpython/expected/plpython_spi.out @@ -451,3 +451,54 @@ SELECT plan_composite_args(); (3,label) (1 row) +-- A custom argument sequence whose length matches the plan but whose +-- __getitem__ raises should be reported as an error, not crash the backend. +CREATE FUNCTION plan_broken_arg_sequence() RETURNS void AS $$ +plan = plpy.prepare("select $1", ["int4"]) +class C: + def __len__(self): + return 1 + def __getitem__(self, i): + raise ValueError('getitem failed') +plpy.execute(plan, C()) +$$ LANGUAGE plpython3u; +SELECT plan_broken_arg_sequence(); +ERROR: spiexceptions.ExternalRoutineException: could not get element 0 from sequence +DETAIL: ValueError: getitem failed +CONTEXT: Traceback (most recent call last): + PL/Python function "plan_broken_arg_sequence", line 8, in + plpy.execute(plan, C()) +PL/Python function "plan_broken_arg_sequence" +-- Likewise for the type-name list passed to plpy.prepare(). +CREATE FUNCTION prepare_broken_type_sequence() RETURNS void AS $$ +class C: + def __len__(self): + return 1 + def __getitem__(self, i): + raise ValueError('getitem failed') +plpy.prepare("select $1", C()) +$$ LANGUAGE plpython3u; +SELECT prepare_broken_type_sequence(); +ERROR: spiexceptions.ExternalRoutineException: could not get element 0 from sequence +DETAIL: ValueError: getitem failed +CONTEXT: Traceback (most recent call last): + PL/Python function "prepare_broken_type_sequence", line 7, in + plpy.prepare("select $1", C()) +PL/Python function "prepare_broken_type_sequence" +-- Likewise for the argument sequence passed to plpy.cursor(). +CREATE FUNCTION cursor_broken_arg_sequence() RETURNS void AS $$ +plan = plpy.prepare("select $1", ["int4"]) +class C: + def __len__(self): + return 1 + def __getitem__(self, i): + raise ValueError('getitem failed') +plpy.cursor(plan, C()) +$$ LANGUAGE plpython3u; +SELECT cursor_broken_arg_sequence(); +ERROR: spiexceptions.ExternalRoutineException: could not get element 0 from sequence +DETAIL: ValueError: getitem failed +CONTEXT: Traceback (most recent call last): + PL/Python function "cursor_broken_arg_sequence", line 8, in + plpy.cursor(plan, C()) +PL/Python function "cursor_broken_arg_sequence" diff --git a/src/pl/plpython/expected/plpython_types.out b/src/pl/plpython/expected/plpython_types.out index 8a680e15c14..0cb3d6ea8c6 100644 --- a/src/pl/plpython/expected/plpython_types.out +++ b/src/pl/plpython/expected/plpython_types.out @@ -796,6 +796,22 @@ SELECT * FROM test_type_conversion_array_error(); ERROR: return value of function with array return type is not a Python sequence CONTEXT: while creating return value PL/Python function "test_type_conversion_array_error" +-- A custom sequence whose __getitem__ raises should be reported as an error, +-- not crash the backend. +CREATE FUNCTION test_type_conversion_array_getitem_fail() RETURNS int[] AS $$ +class C: + def __len__(self): + return 2 + def __getitem__(self, i): + raise ValueError('getitem failed') +return C() +$$ LANGUAGE plpython3u; +SELECT * FROM test_type_conversion_array_getitem_fail(); +ERROR: could not get element 0 from sequence +DETAIL: ValueError: getitem failed +CONTEXT: Traceback (most recent call last): +while creating return value +PL/Python function "test_type_conversion_array_getitem_fail" -- -- Domains over arrays -- diff --git a/src/pl/plpython/plpy_cursorobject.c b/src/pl/plpython/plpy_cursorobject.c index cc74c4df6ba..0725fbc19f2 100644 --- a/src/pl/plpython/plpy_cursorobject.c +++ b/src/pl/plpython/plpy_cursorobject.c @@ -258,6 +258,11 @@ PLy_cursor_plan(PyObject *ob, PyObject *args) PyObject *elem; elem = PySequence_GetItem(args, j); + + /* PySequence_GetItem() can return NULL, with an exception set */ + if (elem == NULL) + PLy_elog(ERROR, "could not get element %d from sequence", j); + PG_TRY(2); { bool isnull; diff --git a/src/pl/plpython/plpy_spi.c b/src/pl/plpython/plpy_spi.c index 4ad40bf78f3..4980873efcf 100644 --- a/src/pl/plpython/plpy_spi.c +++ b/src/pl/plpython/plpy_spi.c @@ -87,6 +87,11 @@ PLy_spi_prepare(PyObject *self, PyObject *args) int32 typmod; optr = PySequence_GetItem(list, i); + + /* PySequence_GetItem() can return NULL, with an exception set */ + if (optr == NULL) + PLy_elog(ERROR, "could not get element %d from sequence", i); + if (PyUnicode_Check(optr)) sptr = PLyUnicode_AsString(optr); else @@ -250,6 +255,11 @@ PLy_spi_execute_plan(PyObject *ob, PyObject *list, long limit) PyObject *elem; elem = PySequence_GetItem(list, j); + + /* PySequence_GetItem() can return NULL, with an exception set */ + if (elem == NULL) + PLy_elog(ERROR, "could not get element %d from sequence", j); + PG_TRY(2); { bool isnull; diff --git a/src/pl/plpython/plpy_typeio.c b/src/pl/plpython/plpy_typeio.c index 92d55bf9f42..e499ed8cbfd 100644 --- a/src/pl/plpython/plpy_typeio.c +++ b/src/pl/plpython/plpy_typeio.c @@ -1210,6 +1210,10 @@ PLySequence_ToArray_recurse(PyObject *obj, ArrayBuildState **astatep, /* fetch the array element */ PyObject *subobj = PySequence_GetItem(obj, i); + /* PySequence_GetItem() can return NULL, with an exception set */ + if (subobj == NULL) + PLy_elog(ERROR, "could not get element %d from sequence", i); + /* need PG_TRY to ensure we release the subobj's refcount */ PG_TRY(); { @@ -1456,7 +1460,10 @@ PLySequence_ToComposite(PLyObToDatum *arg, TupleDesc desc, PyObject *sequence) PG_TRY(); { value = PySequence_GetItem(sequence, idx); - Assert(value); + + /* PySequence_GetItem() can return NULL, with an exception set */ + if (value == NULL) + PLy_elog(ERROR, "could not get element %d from sequence", idx); values[i] = att->func(att, value, &nulls[i], false); diff --git a/src/pl/plpython/sql/plpython_composite.sql b/src/pl/plpython/sql/plpython_composite.sql index 1bb9b83b719..b401b3f2f6b 100644 --- a/src/pl/plpython/sql/plpython_composite.sql +++ b/src/pl/plpython/sql/plpython_composite.sql @@ -233,3 +233,15 @@ CREATE FUNCTION composite_type_as_list_broken() RETURNS type_record[] AS $$ return [['first', 1]]; $$ LANGUAGE plpython3u; SELECT * FROM composite_type_as_list_broken(); + +-- A custom sequence whose length matches the tuple but whose __getitem__ +-- raises should be reported as an error, not crash the backend. +CREATE FUNCTION composite_type_as_broken_sequence() RETURNS type_record AS $$ +class C: + def __len__(self): + return 2 + def __getitem__(self, i): + raise ValueError('getitem failed') +return C() +$$ LANGUAGE plpython3u; +SELECT * FROM composite_type_as_broken_sequence(); diff --git a/src/pl/plpython/sql/plpython_spi.sql b/src/pl/plpython/sql/plpython_spi.sql index 00dcc8bb669..276d130431e 100644 --- a/src/pl/plpython/sql/plpython_spi.sql +++ b/src/pl/plpython/sql/plpython_spi.sql @@ -307,3 +307,42 @@ SELECT cursor_fetch_next_empty(); SELECT cursor_plan(); SELECT cursor_plan_wrong_args(); SELECT plan_composite_args(); + +-- A custom argument sequence whose length matches the plan but whose +-- __getitem__ raises should be reported as an error, not crash the backend. +CREATE FUNCTION plan_broken_arg_sequence() RETURNS void AS $$ +plan = plpy.prepare("select $1", ["int4"]) +class C: + def __len__(self): + return 1 + def __getitem__(self, i): + raise ValueError('getitem failed') +plpy.execute(plan, C()) +$$ LANGUAGE plpython3u; + +SELECT plan_broken_arg_sequence(); + +-- Likewise for the type-name list passed to plpy.prepare(). +CREATE FUNCTION prepare_broken_type_sequence() RETURNS void AS $$ +class C: + def __len__(self): + return 1 + def __getitem__(self, i): + raise ValueError('getitem failed') +plpy.prepare("select $1", C()) +$$ LANGUAGE plpython3u; + +SELECT prepare_broken_type_sequence(); + +-- Likewise for the argument sequence passed to plpy.cursor(). +CREATE FUNCTION cursor_broken_arg_sequence() RETURNS void AS $$ +plan = plpy.prepare("select $1", ["int4"]) +class C: + def __len__(self): + return 1 + def __getitem__(self, i): + raise ValueError('getitem failed') +plpy.cursor(plan, C()) +$$ LANGUAGE plpython3u; + +SELECT cursor_broken_arg_sequence(); diff --git a/src/pl/plpython/sql/plpython_types.sql b/src/pl/plpython/sql/plpython_types.sql index 0985a9cca2f..31549c7f4f1 100644 --- a/src/pl/plpython/sql/plpython_types.sql +++ b/src/pl/plpython/sql/plpython_types.sql @@ -417,6 +417,19 @@ $$ LANGUAGE plpython3u; SELECT * FROM test_type_conversion_array_error(); +-- A custom sequence whose __getitem__ raises should be reported as an error, +-- not crash the backend. +CREATE FUNCTION test_type_conversion_array_getitem_fail() RETURNS int[] AS $$ +class C: + def __len__(self): + return 2 + def __getitem__(self, i): + raise ValueError('getitem failed') +return C() +$$ LANGUAGE plpython3u; + +SELECT * FROM test_type_conversion_array_getitem_fail(); + -- -- Domains over arrays -- 2.39.5 (Apple Git-154)