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buffer,doc: Throw error instead of assert when buffer too large #40243

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buffer,doc: Throw error instead of assert when buffer too large #40243

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1534112
src: throw error instead of assertion
rayw000 Sep 26, 2021
2cb3651
doc: describe buffer limit of v8.serialize
rayw000 Oct 5, 2021
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6 changes: 6 additions & 0 deletions doc/api/v8.md
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Expand Up @@ -323,6 +323,10 @@ added: v8.0.0

Uses a [`DefaultSerializer`][] to serialize `value` into a buffer.

[`ERR_BUFFER_TOO_LARGE`][] will be thrown when trying to
serialize a huge object which requires buffer
larger than [`buffer.constants.MAX_LENGTH`][].

### `v8.deserialize(buffer)`
<!-- YAML
added: v8.0.0
Expand Down Expand Up @@ -548,10 +552,12 @@ A subclass of [`Deserializer`][] corresponding to the format written by
[`DefaultDeserializer`]: #class-v8defaultdeserializer
[`DefaultSerializer`]: #class-v8defaultserializer
[`Deserializer`]: #class-v8deserializer
[`ERR_BUFFER_TOO_LARGE`]: errors.md#err_buffer_too_large
[`Error`]: errors.md#class-error
[`GetHeapSpaceStatistics`]: https://v8docs.nodesource.com/node-13.2/d5/dda/classv8_1_1_isolate.html#ac673576f24fdc7a33378f8f57e1d13a4
[`NODE_V8_COVERAGE`]: cli.md#node_v8_coveragedir
[`Serializer`]: #class-v8serializer
[`buffer.constants.MAX_LENGTH`]: buffer.md#bufferconstantsmax_length
[`deserializer._readHostObject()`]: #deserializer_readhostobject
[`deserializer.transferArrayBuffer()`]: #deserializertransferarraybufferid-arraybuffer
[`serialize()`]: #v8serializevalue
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7 changes: 6 additions & 1 deletion src/node_buffer.cc
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Expand Up @@ -494,7 +494,12 @@ MaybeLocal<Object> New(Environment* env,
size_t length) {
if (length > 0) {
CHECK_NOT_NULL(data);
CHECK(length <= kMaxLength);
// V8 currently only allows a maximum Typed Array index of max Smi.
if (length > kMaxLength) {
Isolate* isolate(env->isolate());
isolate->ThrowException(ERR_BUFFER_TOO_LARGE(isolate));
return Local<Object>();
}
}

auto free_callback = [](char* data, void* hint) { free(data); };
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