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Title: fix: use-after-free in `get_data_from_buffer` by KowalskiThomas · Pull Request #677 · msgpack/msgpack-python · GitHub

Open Graph Title: fix: use-after-free in `get_data_from_buffer` by KowalskiThomas · Pull Request #677 · msgpack/msgpack-python

X Title: fix: use-after-free in `get_data_from_buffer` by KowalskiThomas · Pull Request #677 · msgpack/msgpack-python

Description: What is this PR? There currently is a crash happening when unpacking data from a non-contiguous input. The current PR adds a test to confirm the problem is not happening anymore as well as the fix itself. Running the reproducer with the fix applied makes the crash go away. This is a reproducer: packed = packb(2**32) padded = bytearray() for byte in packed: padded.append(byte) padded.append(0) noncont = memoryview(bytes(padded))[::2] assert not noncont.c_contiguous assert unpackb(noncont) == 2**32 Running it results in the following: ASAN_OPTIONS=detect_leaks=0 python -m pytest test/test_memoryview.py -k test_unpack_noncontiguous_memoryview ================================================================= test session starts ================================================================= platform darwin -- Python 3.16.0a0, pytest-9.0.3, pluggy-1.6.0 rootdir: /Users/thomas.kowalski/Documents/msgpack-python configfile: pyproject.toml collected 14 items / 13 deselected / 1 selected test/test_memoryview.py Fatal Python error: Aborted Current thread 0x00000001ee7898c0 (most recent call first): File "/Users/thomas.kowalski/Documents/msgpack-python/test/test_memoryview.py", line 116 in test_unpack_noncontiguous_memoryview File "/Users/thomas.kowalski/Documents/msgpack-python/venv-asan/lib/python3.16/site-packages/_pytest/python.py", line 166 in pytest_pyfunc_call File "/Users/thomas.kowalski/Documents/msgpack-python/venv-asan/lib/python3.16/site-packages/pluggy/_callers.py", line 121 in _multicall File "/Users/thomas.kowalski/Documents/msgpack-python/venv-asan/lib/python3.16/site-packages/pluggy/_manager.py", line 120 in _hookexec File "/Users/thomas.kowalski/Documents/msgpack-python/venv-asan/lib/python3.16/site-packages/pluggy/_hooks.py", line 512 in __call__ File "/Users/thomas.kowalski/Documents/msgpack-python/venv-asan/lib/python3.16/site-packages/_pytest/python.py", line 1720 in runtest File "/Users/thomas.kowalski/Documents/msgpack-python/venv-asan/lib/python3.16/site-packages/_pytest/runner.py", line 179 in pytest_runtest_call File "/Users/thomas.kowalski/Documents/msgpack-python/venv-asan/lib/python3.16/site-packages/pluggy/_callers.py", line 121 in _multicall File "/Users/thomas.kowalski/Documents/msgpack-python/venv-asan/lib/python3.16/site-packages/pluggy/_manager.py", line 120 in _hookexec File "/Users/thomas.kowalski/Documents/msgpack-python/venv-asan/lib/python3.16/site-packages/pluggy/_hooks.py", line 512 in __call__ File "/Users/thomas.kowalski/Documents/msgpack-python/venv-asan/lib/python3.16/site-packages/_pytest/runner.py", line 245 in File "/Users/thomas.kowalski/Documents/msgpack-python/venv-asan/lib/python3.16/site-packages/_pytest/runner.py", line 353 in from_call File "/Users/thomas.kowalski/Documents/msgpack-python/venv-asan/lib/python3.16/site-packages/_pytest/runner.py", line 244 in call_and_report File "/Users/thomas.kowalski/Documents/msgpack-python/venv-asan/lib/python3.16/site-packages/_pytest/runner.py", line 137 in runtestprotocol File "/Users/thomas.kowalski/Documents/msgpack-python/venv-asan/lib/python3.16/site-packages/_pytest/runner.py", line 118 in pytest_runtest_protocol File "/Users/thomas.kowalski/Documents/msgpack-python/venv-asan/lib/python3.16/site-packages/pluggy/_callers.py", line 121 in _multicall File "/Users/thomas.kowalski/Documents/msgpack-python/venv-asan/lib/python3.16/site-packages/pluggy/_manager.py", line 120 in _hookexec File "/Users/thomas.kowalski/Documents/msgpack-python/venv-asan/lib/python3.16/site-packages/pluggy/_hooks.py", line 512 in __call__ File "/Users/thomas.kowalski/Documents/msgpack-python/venv-asan/lib/python3.16/site-packages/_pytest/main.py", line 396 in pytest_runtestloop File "/Users/thomas.kowalski/Documents/msgpack-python/venv-asan/lib/python3.16/site-packages/pluggy/_callers.py", line 121 in _multicall File "/Users/thomas.kowalski/Documents/msgpack-python/venv-asan/lib/python3.16/site-packages/pluggy/_manager.py", line 120 in _hookexec File "/Users/thomas.kowalski/Documents/msgpack-python/venv-asan/lib/python3.16/site-packages/pluggy/_hooks.py", line 512 in __call__ File "/Users/thomas.kowalski/Documents/msgpack-python/venv-asan/lib/python3.16/site-packages/_pytest/main.py", line 372 in _main File "/Users/thomas.kowalski/Documents/msgpack-python/venv-asan/lib/python3.16/site-packages/_pytest/main.py", line 318 in wrap_session File "/Users/thomas.kowalski/Documents/msgpack-python/venv-asan/lib/python3.16/site-packages/_pytest/main.py", line 365 in pytest_cmdline_main File "/Users/thomas.kowalski/Documents/msgpack-python/venv-asan/lib/python3.16/site-packages/pluggy/_callers.py", line 121 in _multicall File "/Users/thomas.kowalski/Documents/msgpack-python/venv-asan/lib/python3.16/site-packages/pluggy/_manager.py", line 120 in _hookexec File "/Users/thomas.kowalski/Documents/msgpack-python/venv-asan/lib/python3.16/site-packages/pluggy/_hooks.py", line 512 in __call__ File "/Users/thomas.kowalski/Documents/msgpack-python/venv-asan/lib/python3.16/site-packages/_pytest/config/__init__.py", line 199 in main File "/Users/thomas.kowalski/Documents/msgpack-python/venv-asan/lib/python3.16/site-packages/_pytest/config/__init__.py", line 223 in console_main File "/Users/thomas.kowalski/Documents/msgpack-python/venv-asan/lib/python3.16/site-packages/pytest/__main__.py", line 9 in File "", line 87 in _run_code File "", line 201 in _run_module_as_main Current thread's C stack trace (most recent call first): Binary file "/Users/thomas.kowalski/Documents/cpython-asan/install/bin/python3.16", at _Py_DumpStack+0xf4 [0x102fc4bc0] Binary file "/Users/thomas.kowalski/Documents/cpython-asan/install/bin/python3.16", at faulthandler_fatal_error+0x470 [0x10300492c] Binary file "/usr/lib/system/libsystem_platform.dylib", at _sigtramp+0x38 [0x1829897a4] Binary file "/usr/lib/system/libsystem_pthread.dylib", at pthread_kill+0x128 [0x18297f8d8] Binary file "/usr/lib/system/libsystem_c.dylib", at abort+0x94 [0x182886790] Binary file "/opt/homebrew/Cellar/llvm/22.1.5/lib/clang/22/lib/darwin/libclang_rt.asan_osx_dynamic.dylib", at _ZN11__sanitizer6AtexitEPFvvE+0x0 [0x103efc4cc] Binary file "/opt/homebrew/Cellar/llvm/22.1.5/lib/clang/22/lib/darwin/libclang_rt.asan_osx_dynamic.dylib", at _ZN11__sanitizer3DieEv+0x68 [0x103efb9fc] Binary file "/opt/homebrew/Cellar/llvm/22.1.5/lib/clang/22/lib/darwin/libclang_rt.asan_osx_dynamic.dylib", at _ZN6__asan19ScopedInErrorReportD2Ev+0x4a8 [0x103eddebc] Binary file "/opt/homebrew/Cellar/llvm/22.1.5/lib/clang/22/lib/darwin/libclang_rt.asan_osx_dynamic.dylib", at _ZN6__asan18ReportGenericErrorEmmmmbmjb+0x78c [0x103edd130] Binary file "/opt/homebrew/Cellar/llvm/22.1.5/lib/clang/22/lib/darwin/libclang_rt.asan_osx_dynamic.dylib", at __asan_report_load1+0x3c [0x103ede3cc] Binary file "/Users/thomas.kowalski/Documents/msgpack-python/msgpack/_cmsgpack.cpython-316-darwin.so", at unpack_execute+0x3b0 [0x10ec58328] Binary file "/Users/thomas.kowalski/Documents/msgpack-python/msgpack/_cmsgpack.cpython-316-darwin.so", at unpack_construct+0x38 [0x10ec57f6c] Binary file "/Users/thomas.kowalski/Documents/msgpack-python/msgpack/_cmsgpack.cpython-316-darwin.so", at __pyx_pf_7msgpack_9_cmsgpack_2unpackb+0x7c0 [0x10ec70a48] Binary file "/Users/thomas.kowalski/Documents/msgpack-python/msgpack/_cmsgpack.cpython-316-darwin.so", at __pyx_pw_7msgpack_9_cmsgpack_3unpackb+0xd7c [0x10ec7010c] Binary file "/Users/thomas.kowalski/Documents/msgpack-python/msgpack/_cmsgpack.cpython-316-darwin.so", at __Pyx_CyFunction_Vectorcall_FASTCALL_KEYWORDS+0x198 [0x10ec6e430] Binary file "/Users/thomas.kowalski/Documents/cpython-asan/install/bin/python3.16", at PyObject_Vectorcall+0xdc [0x102ada240] Binary file "/Users/thomas.kowalski/Documents/cpython-asan/install/bin/python3.16", at _Py_VectorCallInstrumentation_StackRefSteal+0x2b8 [0x102e30e10] Binary file "/Users/thomas.kowalski/Documents/cpython-asan/install/bin/python3.16", at _PyEval_EvalFrameDefault+0x1d998 [0x102e50dc4] Binary file "/Users/thomas.kowalski/Documents/cpython-asan/install/bin/python3.16", at _PyEval_Vector+0x420 [0x102e30068] Binary file "/Users/thomas.kowalski/Documents/cpython-asan/install/bin/python3.16", at _PyObject_VectorcallDictTstate+0x1a4 [0x102ad88a0] Binary file "/Users/thomas.kowalski/Documents/cpython-asan/install/bin/python3.16", at _PyObject_Call_Prepend+0x134 [0x102adb134] Binary file "/Users/thomas.kowalski/Documents/cpython-asan/install/bin/python3.16", at slot_tp_call+0x124 [0x102c5d2f0] Binary file "/Users/thomas.kowalski/Documents/cpython-asan/install/bin/python3.16", at _PyObject_MakeTpCall+0x1ac [0x102ad8d94] Binary file "/Users/thomas.kowalski/Documents/cpython-asan/install/bin/python3.16", at _Py_VectorCallInstrumentation_StackRefSteal+0x2b8 [0x102e30e10] Binary file "/Users/thomas.kowalski/Documents/cpython-asan/install/bin/python3.16", at _PyEval_EvalFrameDefault+0x13f44 [0x102e47370] Binary file "/Users/thomas.kowalski/Documents/cpython-asan/install/bin/python3.16", at _PyEval_Vector+0x420 [0x102e30068] Binary file "/Users/thomas.kowalski/Documents/cpython-asan/install/bin/python3.16", at _PyObject_VectorcallDictTstate+0x1a4 [0x102ad88a0] Binary file "/Users/thomas.kowalski/Documents/cpython-asan/install/bin/python3.16", at _PyObject_Call_Prepend+0x134 [0x102adb134] Binary file "/Users/thomas.kowalski/Documents/cpython-asan/install/bin/python3.16", at slot_tp_call+0x124 [0x102c5d2f0] Binary file "/Users/thomas.kowalski/Documents/cpython-asan/install/bin/python3.16", at _PyObject_Call+0x13c [0x102ada544] Binary file "/Users/thomas.kowalski/Documents/cpython-asan/install/bin/python3.16", at _PyEval_EvalFrameDefault+0x2b40 [0x102e35f6c] Binary file "/Users/thomas.kowalski/Documents/cpython-asan/install/bin/python3.16", at _PyEval_Vector+0x420 [0x102e30068] Extension modules: msgpack._cmsgpack (total: 1) zsh: abort ASAN_OPTIONS=detect_leaks=0 python -m pytest test/test_memoryview.py -k

Open Graph Description: What is this PR? There currently is a crash happening when unpacking data from a non-contiguous input. The current PR adds a test to confirm the problem is not happening anymore as well as the fix ...

X Description: What is this PR? There currently is a crash happening when unpacking data from a non-contiguous input. The current PR adds a test to confirm the problem is not happening anymore as well as the fix ...

Opengraph URL: https://github.com/msgpack/msgpack-python/pull/677

X: @github

direct link

Domain: github.com

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fix: use-after-free in get_data_from_buffer https://github.com/msgpack/msgpack-python/pull/677/files#top
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9086469 test: add test KowalskiThomas May 26, 2026 https://github.com/msgpack/msgpack-python/pull/677/commits/9086469e18faefb0fd8323840ec2b0b14eb2a1f7
eae29a9 fix: use-after-free in get_data_from_buffer KowalskiThomas May 26, 2026 https://github.com/msgpack/msgpack-python/pull/677/commits/eae29a954e11261313fc4ba1ef05d91faa3bb4a0
7ee15a3 fix: address PR review comments KowalskiThomas May 27, 2026 https://github.com/msgpack/msgpack-python/pull/677/commits/7ee15a324b50feb2c86fc31152b099045f5fd02e
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