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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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5 changed files with 95 additions and 6 deletions
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15
Python/flowgraph.c
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@ -1295,6 +1295,14 @@ get_const_value(int opcode, int oparg, PyObject *co_consts)
PyObject *constant = NULL;
assert(loads_const(opcode));
if (opcode == LOAD_CONST) {
assert(PyList_Check(co_consts));
Py_ssize_t n = PyList_GET_SIZE(co_consts);
if (oparg < 0 || oparg >= n) {
PyErr_Format(PyExc_ValueError,
"LOAD_CONST index %d is out of range for consts (len=%zd)",
oparg, n);
return NULL;
}
constant = PyList_GET_ITEM(co_consts, oparg);
}
if (opcode == LOAD_SMALL_INT) {
@ -2153,6 +2161,9 @@ basicblock_optimize_load_const(PyObject *const_cache, basicblock *bb, PyObject *
cfg_instr *inst = &bb->b_instr[i];
if (inst->i_opcode == LOAD_CONST) {
PyObject *constant = get_const_value(inst->i_opcode, inst->i_oparg, consts);
if (constant == NULL) {
return ERROR;
}
int res = maybe_instr_make_load_smallint(inst, constant, consts, const_cache);
Py_DECREF(constant);
if (res < 0) {
@ -4073,6 +4084,10 @@ _PyCompile_OptimizeCfg(PyObject *seq, PyObject *consts, int nlocals)
PyErr_SetString(PyExc_ValueError, "expected an instruction sequence");
return NULL;
}
if (!PyList_Check(consts)) {
PyErr_SetString(PyExc_TypeError, "consts must be a list");
return NULL;
}
PyObject *const_cache = PyDict_New();
if (const_cache == NULL) {
return NULL;