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Merge pull request #1633 from ethereum/negative-length-arrays

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Reject negative length arrays
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chriseth 2017-02-02 11:57:46 +01:00 committed by GitHub
commit b3b82c46e7
4 changed files with 18 additions and 0 deletions
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3
Changelog.md
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@ -3,6 +3,9 @@
Features:
* Type system: Support explicit conversion of external function to address.
Bugfixes:
* Type system: Disallow arrays with negative length.
### 0.4.9 (2017-01-31)
Features:

2
libsolidity/analysis/ReferencesResolver.cpp
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@ -130,6 +130,8 @@ void ReferencesResolver::endVisit(ArrayTypeName const& _typeName)
auto const* lengthType = dynamic_cast<RationalNumberType const*>(length->annotation().type.get());
if (!lengthType || lengthType->isFractional())
fatalTypeError(length->location(), "Invalid array length, expected integer literal.");
else if (lengthType->isNegative())
fatalTypeError(length->location(), "Array with negative length specified.");
else
_typeName.annotation().type = make_shared<ArrayType>(DataLocation::Storage, baseType, lengthType->literalValue(nullptr));
}

3
libsolidity/ast/Types.h
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@ -411,6 +411,9 @@ public:
/// @returns true if the value is not an integer.
bool isFractional() const { return m_value.denominator() != 1; }
/// @returns true if the value is negative.
bool isNegative() const { return m_value < 0; }
private:
rational m_value;
};

10
test/libsolidity/SolidityNameAndTypeResolution.cpp
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@ -1919,6 +1919,16 @@ BOOST_AUTO_TEST_CASE(array_with_nonconstant_length)
CHECK_ERROR(text, TypeError, "");
}
BOOST_AUTO_TEST_CASE(array_with_negative_length)
{
char const* text = R"(
contract c {
function f(uint a) { uint8[-1] x; }
}
)";
CHECK_ERROR(text, TypeError, "Array with negative length specified");
}
BOOST_AUTO_TEST_CASE(array_copy_with_different_types1)
{
char const* text = R"(