From 774bb8ab3baa9d7b5e6368dcd0f887b13ff26ae8 Mon Sep 17 00:00:00 2001 From: chriseth Date: Sun, 7 Aug 2016 19:46:11 +0200 Subject: Make function calls throw if target does not have code. Low-level calls still just execute and will actually report "success". This allows `x.call.value(y)()` for x being a non-contract account. --- libsolidity/codegen/ExpressionCompiler.cpp | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'libsolidity') diff --git a/libsolidity/codegen/ExpressionCompiler.cpp b/libsolidity/codegen/ExpressionCompiler.cpp index 1f93cf8c..e8350931 100644 --- a/libsolidity/codegen/ExpressionCompiler.cpp +++ b/libsolidity/codegen/ExpressionCompiler.cpp @@ -1517,6 +1517,13 @@ void ExpressionCompiler::appendExternalFunctionCall( m_context << u256(0); m_context << dupInstruction(m_context.baseToCurrentStackOffset(contractStackPos)); + // Check the the target contract exists (has code) for non-low-level calls. + if (funKind == FunctionKind::External || funKind == FunctionKind::CallCode || funKind == FunctionKind::DelegateCall) + { + m_context << Instruction::DUP1 << Instruction::EXTCODESIZE << Instruction::ISZERO; + m_context.appendConditionalJumpTo(m_context.errorTag()); + } + if (_functionType.gasSet()) m_context << dupInstruction(m_context.baseToCurrentStackOffset(gasStackPos)); else -- cgit v1.2.3