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gh-146250: Fix memory leak in re-initialization of SyntaxError #146251

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Merged
kumaraditya303 merged 6 commits into from
Mar 27, 2026
Merged

gh-146250: Fix memory leak in re-initialization of SyntaxError #146251

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9370f4f
gh-146250: Fix memory leak of re-initialization of `SyntaxError`
brijkapadia Mar 21, 2026
2371ae9
📜🤖 Added by blurb_it.
blurb-it[bot] Mar 21, 2026
f66f5ae
Apply suggestions from code review
brijkapadia Mar 21, 2026
601d63f
Updated variable memory management and moved test
brijkapadia Mar 21, 2026
dff89fe
small change
brijkapadia Mar 21, 2026
22cff11
Check (optional) attributes update
brijkapadia Mar 21, 2026
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6 changes: 6 additions & 0 deletions Lib/test/test_exceptions.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1954,6 +1954,12 @@ def test_exec_set_nomemory_hang(self):
self.assertGreater(len(output), 0) # At minimum, should not hang
self.assertIn(b"MemoryError", output)

# gh-146250: memory leak with re-initialization of SyntaxError
def test_syntax_error_memory_leak(self):
# Test crashes with ASan
e = SyntaxError("msg", ("file.py", 1, 2, "txt", 2, 3))
e.__init__("new_msg", ("new_file.py", 2, 3, "new_txt", 3, 4))


class NameErrorTests(unittest.TestCase):
def test_name_error_has_name(self):
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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Core_and_Builtins/2026-03-21-11-55-16.gh-issue-146250.ahl3O2.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
Fixed a memory leak in :class:`SyntaxError` when re-initializing it.
10 changes: 8 additions & 2 deletions Objects/exceptions.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2802,8 +2802,14 @@ SyntaxError_init(PyObject *op, PyObject *args, PyObject *kwds)
return -1;
}

self->end_lineno = NULL;
self->end_offset = NULL;
Py_XDECREF(self->filename);
Py_XDECREF(self->lineno);
Py_XDECREF(self->offset);
Py_XDECREF(self->text);
Py_XSETREF(self->end_lineno, NULL);
Py_XSETREF(self->end_offset, NULL);
Py_XDECREF(self->metadata);

if (!PyArg_ParseTuple(info, "OOOO|OOO",
&self->filename, &self->lineno,
&self->offset, &self->text,
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