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[3.13] gh-132835: Add defensive NULL checks to MRO resolution (GH-134763) (GH-140437) 
Currently, there are a few places where tp_mro could theoretically
become NULL, but do not in practice. This commit adds defensive checks for
NULL values to ensure that any changes do not introduce a crash and that
state invariants are upheld.

The assertions added in this commit are all instances where a NULL value would get passed to something not expecting a NULL, so it is better to catch an assertion failure than crash later on.

There are a few cases where it is OK for the return of lookup_tp_mro to be NULL, such as when passed to is_subtype_with_mro, which handles this explicitly.
(cherry picked from commit a8edca62fc)

Co-authored-by: Emma Smith <emma@emmatyping.dev>
2025-10-21 20:44:42 -07:00
..
clinic [3.13] gh-128714: Fix function object races in __annotate__, __annotations__ and __type_params__ in free-threading build (GH-129016) (#129729) 2025-02-23 21:49:55 -05:00
mimalloc [3.13] Fix typos (#123775) (#123866) 2024-10-07 23:44:31 +02:00
stringlib [3.13] gh-127971: fix off-by-one read beyond the end of a string during search (#132574) (#136648) 2025-07-14 11:50:22 +02:00
abstract.c gh-116316: Fix typo in UNARY_FUNC(PyNumber_Positive) macros (GH-116317) 2024-03-04 17:57:01 +00:00
boolobject.c [3.13] gh-122982: Extend the deprecation period for bool inversion by two years (GH-123306) (#123316) 2024-08-25 19:48:34 +00:00
bytearrayobject.c [3.13] gh-91153: prevent a crash in bytearray.__setitem__(ind, ...) when ind.__index__ has side-effects (GH-132379) (#136582) 2025-07-12 16:34:45 +02:00
bytes_methods.c gh-117431: Adapt bytes and bytearray .find() and friends to Argument Clinic (#117502) 2024-04-12 07:40:55 +00:00
bytesobject.c [3.13] gh-133767: Fix use-after-free in the unicode-escape decoder with an error handler (GH-129648) (GH-133944) 2025-05-20 14:46:57 +02:00
call.c
capsule.c [3.13] gh-124538: Fix crash when using gc.get_referents on an untracked capsule object (GH-124559) (#124588) 2024-09-26 13:51:58 -07:00
cellobject.c gh-117323: Make cell thread-safe in free-threaded builds (#117330) 2024-03-29 13:35:43 -04:00
classobject.c [3.13] gh-135607: remove null checking of weakref list in dealloc of extension modules and objects (#135614) (#136126) 2025-07-01 11:26:52 +02:00
codeobject.c [3.13] gh-135607: remove null checking of weakref list in dealloc of extension modules and objects (#135614) (#136126) 2025-07-01 11:26:52 +02:00
complexobject.c [3.13] gh-113841: fix possible undefined division by 0 in _Py_c_pow() (GH-127211) (#127216) 2024-12-02 15:42:02 +01:00
descrobject.c [3.13] gh-132747: Fix NULL dereference when calling a method's __get__ manually (GH-132772) (#132786) 2025-04-21 21:38:51 +00:00
dictnotes.txt
dictobject.c [3.13] GH-140058: Clear key and value if PyTuple_New fails in dictiter_iternextitem (GH-140059) (#140108) 2025-10-14 13:40:13 +00:00
enumobject.c
exception_handling_notes.txt
exceptions.c [3.13] gh-129668: Fix thread-safety of MemoryError freelist in free threaded build (gh-129704) (gh-129742) 2025-02-06 13:27:30 -05:00
fileobject.c gh-87193: Support bytes objects with refcount > 1 in _PyBytes_Resize() (GH-117160) 2024-03-25 16:32:11 +01:00
floatobject.c [3.13] gh-121905: Consistently use "floating-point" instead of "floating point" (GH-121907) (GH-122012) 2024-07-19 09:13:08 +00:00
frame_layout.md
frameobject.c [3.13] gh-128396: Fix a crash when inline comprehension has the same … (#130311) 2025-02-19 17:40:03 +00:00
funcobject.c [3.13] gh-135607: remove null checking of weakref list in dealloc of extension modules and objects (#135614) (#136126) 2025-07-01 11:26:52 +02:00
genericaliasobject.c [3.13] gh-138479: Ensure that __typing_subst__ returns a tuple (GH-138482) (GH-138786) 2025-09-11 11:08:57 +00:00
genobject.c [3.13] gh-138902: Fix generator send arg name (GH-138905) (#138913) 2025-09-15 11:35:22 +00:00
iterobject.c [3.13] gh-128078: Clear exception in anext before calling _PyGen_SetStopIterationValue (GH-128780) (#128785) 2025-01-13 13:20:49 +00:00
listobject.c [3.13] GH-133136: Revise QSBR to reduce excess memory held (gh-135473) (gh-136480) 2025-07-30 11:06:44 -07:00
listsort.txt GH-116939: Rewrite binarysort() (#116940) 2024-03-21 22:27:25 -05:00
lnotab_notes.txt Document the co_lines method on code objects (#113682) 2024-01-03 19:29:24 +00:00
locations.md
longobject.c [3.13] gh-71810: Fix _PyLong_AsByteArray() undefined behavior (GH-138873) (#138884) 2025-09-14 09:49:23 +00:00
memoryobject.c [3.13] gh-126341: add release check to __iter__ method of memoryview (GH-126759) (#126778) 2024-11-13 19:05:59 +00:00
methodobject.c [3.13] gh-135607: remove null checking of weakref list in dealloc of extension modules and objects (#135614) (#136126) 2025-07-01 11:26:52 +02:00
moduleobject.c [3.13] gh-135607: remove null checking of weakref list in dealloc of extension modules and objects (#135614) (#136126) 2025-07-01 11:26:52 +02:00
namespaceobject.c [3.13] gh-135878: Fix crash in types.SimpleNamespace.__repr__ (GH-135889) (#135895) 2025-06-24 16:59:29 +00:00
object.c [3.13] gh-117657: Enable test_opcache under TSAN (GH-129831) (GH-130597) 2025-02-26 13:59:59 -05:00
object_layout.md GH-115776: Embed the values array into the object, for "normal" Python objects. (GH-116115) 2024-04-02 11:59:21 +01:00
object_layout_312.gv GH-115776: Embed the values array into the object, for "normal" Python objects. (GH-116115) 2024-04-02 11:59:21 +01:00
object_layout_312.png [3.13] gh-71648: Optimize PNG files (GH-138842) (#138852) 2025-09-14 08:29:59 -07:00
object_layout_313.gv GH-115776: Embed the values array into the object, for "normal" Python objects. (GH-116115) 2024-04-02 11:59:21 +01:00
object_layout_313.png [3.13] gh-71648: Optimize PNG files (GH-138842) (#138852) 2025-09-14 08:29:59 -07:00
object_layout_full_312.gv
object_layout_full_312.png [3.13] gh-71648: Optimize PNG files (GH-138842) (#138852) 2025-09-14 08:29:59 -07:00
object_layout_full_313.gv GH-115776: Embed the values array into the object, for "normal" Python objects. (GH-116115) 2024-04-02 11:59:21 +01:00
object_layout_full_313.png [3.13] gh-71648: Optimize PNG files (GH-138842) (#138852) 2025-09-14 08:29:59 -07:00
obmalloc.c [3.13] GH-133136: Revise QSBR to reduce excess memory held (gh-135473) (gh-136480) 2025-07-30 11:06:44 -07:00
odictobject.c [3.13] gh-138516: fix typo in OrderedDict exception msg (GH-138517) (#138522) 2025-09-05 07:19:43 +00:00
picklebufobject.c [3.13] gh-135607: remove null checking of weakref list in dealloc of extension modules and objects (#135614) (#136126) 2025-07-01 11:26:52 +02:00
rangeobject.c gh-117764: Fix and add signatures for many builtins (GH-117769) 2024-04-12 13:56:41 +03:00
README
setobject.c [3.13] gh-135607: remove null checking of weakref list in dealloc of extension modules and objects (#135614) (#136126) 2025-07-01 11:26:52 +02:00
sliceobject.c gh-117764: Add docstrings and signatures for the types of None, Ellipsis and NotImplemented (GH-117813) 2024-04-12 15:45:23 +03:00
structseq.c [3.13] gh-123091: Use more _Py_IsImmortalLoose() (GH-123602) (GH-123622) 2024-09-03 12:36:42 +02:00
tupleobject.c [3.13] gh-126076: Account for relocated objects in tracemalloc (GH-126077) (#127823) 2024-12-11 14:15:37 +01:00
typeobject.c [3.13] gh-132835: Add defensive NULL checks to MRO resolution (GH-134763) (GH-140437) 2025-10-21 20:44:42 -07:00
typeslots.inc
typeslots.py
typevarobject.c [3.13] gh-140000: Traverse name attribute for TypeVar, TypeVarTuple, TypeAliasType, ParamSpec (GH-140016) (#140073) 2025-10-13 20:02:32 -07:00
unicodectype.c [3.13] gh-82045: Correct and deduplicate "isprintable" docs; add test. (GH-130127) 2025-02-17 15:02:39 +01:00
unicodeobject.c [3.13] gh-58124: Avoid CP_UTF8 in UnicodeDecodeError (GH-137415) (#137461) 2025-08-06 12:59:11 +00:00
unicodetype_db.h
unionobject.c [3.13] gh-132713: Fix typing.Union[index] race condition (GH-132802) (#132839) 2025-04-23 14:12:03 +00:00
weakrefobject.c [3.13] gh-121652: Handle allocate_weakref returning NULL (GH-121653) (#121721) 2024-07-13 16:31:50 +00:00

README 

Source files for various builtin objects