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gh-148973: fix segfault on mismatch between consts size and oparg in compiler (#148974)

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Irit Katriel 2026-04-25 10:47:41 +01:00 • committed by GitHub
parent db0ee44b93
commit c650b51c32
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5 changed files with 95 additions and 6 deletions
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14
Python/compile.c
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@ -1658,6 +1658,7 @@ _PyCompile_CodeGen(PyObject *ast, PyObject *filename, PyCompilerFlags *pflags,
{
PyObject *res = NULL;
PyObject *metadata = NULL;
PyObject *consts_list = NULL;
if (!PyAST_Check(ast)) {
PyErr_SetString(PyExc_TypeError, "expected an AST");
@ -1712,12 +1713,23 @@ _PyCompile_CodeGen(PyObject *ast, PyObject *filename, PyCompilerFlags *pflags,
}
if (_PyInstructionSequence_ApplyLabelMap(_PyCompile_InstrSequence(c)) < 0) {
return NULL;
goto finally;
}
/* After AddReturnAtEnd: co_consts indices match the final instruction stream. */
consts_list = consts_dict_keys_inorder(umd->u_consts);
if (consts_list == NULL) {
goto finally;
}
if (PyDict_SetItemString(metadata, "consts", consts_list) < 0) {
goto finally;
}
/* Allocate a copy of the instruction sequence on the heap */
res = _PyTuple_FromPair((PyObject *)_PyCompile_InstrSequence(c), metadata);
finally:
Py_XDECREF(consts_list);
Py_XDECREF(metadata);
_PyCompile_ExitScope(c);
compiler_free(c);