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fix: use-after-free in get_data_from_buffer #677

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Merged
methane merged 3 commits into from
Jun 2, 2026
Merged

fix: use-after-free in get_data_from_buffer #677

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9086469
test: add test
KowalskiThomas May 26, 2026
eae29a9
fix: use-after-free in get_data_from_buffer
KowalskiThomas May 26, 2026
7ee15a3
fix: address PR review comments
KowalskiThomas May 27, 2026
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fix: address PR review comments 
- Check PyObject_GetBuffer return value and raise on failure
- Avoid unnecessary tobytes() copy for contiguous memoryviews in fallback feed()
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@KowalskiThomas
KowalskiThomas committed May 27, 2026
commit 7ee15a324b50feb2c86fc31152b099045f5fd02e
3 changes: 2 additions & 1 deletion msgpack/_unpacker.pyx
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Expand Up @@ -129,7 +129,8 @@ cdef inline int get_data_from_buffer(object obj,
PyBuffer_Release(view)
# create a contiguous copy and get buffer
contiguous = PyMemoryView_GetContiguous(obj, PyBUF_READ, b'C')
PyObject_GetBuffer(contiguous, view, PyBUF_SIMPLE)
if PyObject_GetBuffer(contiguous, view, PyBUF_SIMPLE) == -1:
raise

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buffer_len[0] = view.len
buf[0] = <char*> view.buf
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3 changes: 1 addition & 2 deletions msgpack/fallback.py
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Expand Up @@ -328,8 +328,7 @@ def feed(self, next_bytes):
self._buf_checkpoint = 0

# Use extend here: INPLACE_ADD += doesn't reliably typecast memoryview in jython
# tobytes ensures compatibility with non-contiguous memoryviews
self._buffer.extend(view.tobytes())
self._buffer.extend(view if view.contiguous else view.tobytes())
view.release()
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def _consume(self):
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