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To: pgsql-committers@lists.postgresql.org
Subject: pgsql: plpython: Fix NULL pointer dereferences for broken sequence and
Date: Mon, 29 Jun 2026 02:45:19 +0000
Message-ID: <E1we1zr-000b6o-12@gemulon.postgresql.org> (raw)
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.
Author: Richard Guo <guofenglinux@gmail.com>
Reviewed-by: Ayush Tiwari <ayushtiwari.slg01@gmail.com>
Discussion: https://postgr.es/m/CAMbWs49BKM9wP6m8bCXEpHwQKp7usvOGV6Jf=J7FYr_BCpxLqg@mail.gmail.com
Backpatch-through: 14
Branch
------
REL_17_STABLE
Details
-------
https://git.postgresql.org/pg/commitdiff/3dc59c1737d288dd8d5738bdb702615017098942
Modified Files
--------------
.../hstore_plpython/expected/hstore_plpython.out | 65 ++++++++++++++++
contrib/hstore_plpython/hstore_plpython.c | 16 ++++
contrib/hstore_plpython/sql/hstore_plpython.sql | 65 ++++++++++++++++
contrib/jsonb_plpython/expected/jsonb_plpython.out | 89 ++++++++++++++++++++++
contrib/jsonb_plpython/jsonb_plpython.c | 21 ++++-
contrib/jsonb_plpython/sql/jsonb_plpython.sql | 77 +++++++++++++++++++
src/pl/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(-)
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Subject: Re: pgsql: plpython: Fix NULL pointer dereferences for broken sequence and
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