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gh-132617: Fix dict.update() mutation check (gh-134815)

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Use `ma_used` instead of `ma_keys->dk_nentries` for modification check
so that we only check if the dictionary is modified, not if new keys are
added to a different dictionary that shared the same keys object.
This commit is contained in:
Sam Gross 2025-06-16 12:55:20 -04:00 • committed by GitHub
parent 4c15505071
commit d8994b0a77
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3 changed files with 37 additions and 2 deletions
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4
Objects/dictobject.c
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@ -3858,7 +3858,7 @@ dict_dict_merge(PyInterpreterState *interp, PyDictObject *mp, PyDictObject *othe
}
}
Py_ssize_t orig_size = other->ma_keys->dk_nentries;
Py_ssize_t orig_size = other->ma_used;
Py_ssize_t pos = 0;
Py_hash_t hash;
PyObject *key, *value;
@ -3892,7 +3892,7 @@ dict_dict_merge(PyInterpreterState *interp, PyDictObject *mp, PyDictObject *othe
if (err != 0)
return -1;
if (orig_size != other->ma_keys->dk_nentries) {
if (orig_size != other->ma_used) {
PyErr_SetString(PyExc_RuntimeError,
"dict mutated during update");
return -1;