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LibJS/Bytecode: Set accumulator to undefined at start of catch blocks

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Otherwise we leak the error value through to the result.
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Luke Wilde 2023-06-25 20:52:06 +01:00 • committed by Andreas Kling
parent 1789905d4a
commit b162c9117e
1 changed files with 5 additions and 0 deletions
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5
Userland/Libraries/LibJS/Bytecode/ASTCodegen.cpp
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@ -2086,6 +2086,11 @@ Bytecode::CodeGenerationErrorOr<void> TryStatement::generate_bytecode(Bytecode::
return {};
}));
// Set accumulator to undefined, otherwise we leak the error object through the accumulator.
// For example: `try { BigInt.call() } catch {}` would result in the error object. Note that
// the exception _is_ caught here, it just leaks the error object through to the result.
generator.emit<Bytecode::Op::LoadImmediate>(js_undefined());
TRY(m_handler->body().generate_bytecode(generator));
handler_target = Bytecode::Label { handler_block };
generator.end_variable_scope();