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[3.14] gh-148973: fix segfault on mismatch between consts size and oparg in compiler (GH-148974) (#148980)

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gh-148973: fix segfault on mismatch between consts size and oparg in compiler (GH-148974)
(cherry picked from commit c650b51c32)

Co-authored-by: Irit Katriel <1055913+iritkatriel@users.noreply.github.com>
This commit is contained in:
Miss Islington (bot) 2026-04-25 14:53:42 +02:00 • committed by GitHub
parent 89f44ac422
commit 8acb98a1c2
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GPG key ID: B5690EEEBB952194
5 changed files with 95 additions and 6 deletions
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14
Python/compile.c
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@ -1610,6 +1610,7 @@ _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");
@ -1664,12 +1665,23 @@ _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_Pack(2, _PyCompile_InstrSequence(c), metadata);
finally:
Py_XDECREF(consts_list);
Py_XDECREF(metadata);
_PyCompile_ExitScope(c);
compiler_free(c);