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https://github.com/RGBCube/serenity
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parent
b2a849935b
commit
6fc0b2a43d
2 changed files with 19 additions and 3 deletions
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@ -4,6 +4,7 @@
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Checked.h>
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#include <AK/TypeCasts.h>
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#include <LibJS/Runtime/DataViewPrototype.h>
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@ -87,13 +88,19 @@ static Value get_view_value(GlobalObject& global_object, Value request_index, Va
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auto view_size = view->byte_length();
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auto element_size = sizeof(T);
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if (get_index + element_size > view_size) {
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Checked<size_t> buffer_index = get_index;
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buffer_index += view_offset;
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Checked<size_t> end_index = get_index;
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end_index += element_size;
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if (buffer_index.has_overflow() || end_index.has_overflow() || end_index.value() > view_size) {
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vm.throw_exception<RangeError>(global_object, ErrorType::DataViewOutOfRangeByteOffset, get_index, view_size);
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return {};
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}
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auto buffer_index = get_index + view_offset;
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return buffer->get_value<T>(buffer_index, false, ArrayBuffer::Order::Unordered, little_endian);
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return buffer->get_value<T>(buffer_index.value(), false, ArrayBuffer::Order::Unordered, little_endian);
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}
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// 25.3.1.2 SetViewValue ( view, requestIndex, isLittleEndian, type, value ), https://tc39.es/ecma262/#sec-setviewvalue
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@ -0,0 +1,9 @@
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test("Issue #9336, integer overflow in get_view_value", () => {
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const dataView = new DataView(new ArrayBuffer(16));
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expect(() => {
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dataView.getUint32(0xfffffffc);
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}).toThrowWithMessage(
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RangeError,
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"Data view byte offset 4294967292 is out of range for buffer with length 16"
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);
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});
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