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Raise TypeError when calling __new__ unsafely #4455

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Raise TypeError when calling __new__ unsafely #4455

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18 changes: 18 additions & 0 deletions vm/src/builtins/type.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1308,6 +1308,24 @@ pub(crate) fn call_slot_new(
args: FuncArgs,
vm: &VirtualMachine,
) -> PyResult {
let mut staticbase = Some(subtype.clone());
while let Some(ref basetype) = staticbase {
if (basetype.flags() & PyTypeFlags::HEAPTYPE.bits()) != 0 {
staticbase = basetype.base().clone();
} else {
break;
}
}
if let Some(ref basetype) = staticbase {
if !typ.fast_issubclass(basetype) {
return Err(vm.new_type_error(format!(
"{}.__new__({}) is not safe, use {}.__new__()",
typ.name(),
subtype.name(),
basetype.name()
)));
}
}
let slot_new = typ
.deref()
.mro_find_map(|cls| cls.slots.new.load())
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