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@0x/contracts-staking: Fix overflow w/ LibFixedMath._mul(-1, -2*255).

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This commit is contained in:
Lawrence Forman
2019-11-01 12:51:19 -04:00
parent 8e6d92cad5
commit 4f56d68689
3 changed files with 19 additions and 4 deletions
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17
contracts/staking/test/unit_tests/lib_fixed_math_test.ts
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@@ -184,14 +184,14 @@ blockchainTests('LibFixedMath unit tests', env => {
return expect(tx).to.revertWith(expectedError);
});
it('mulDiv(MIN_FIXED, int(-1), int(1)) throws', async () => {
const [a, n, d] = [MIN_FIXED_VALUE, -1, 1];
it('mulDiv(int(-1), MIN_FIXED, int(1)) throws', async () => {
const [a, n, d] = [-1, MIN_FIXED_VALUE, 1];
const expectedError = new FixedMathRevertErrors.BinOpError(
FixedMathRevertErrors.BinOpErrorCodes.MultiplicationOverflow,
a,
n,
);
const tx = testContract.mulDiv.callAsync(a, new BigNumber(n), new BigNumber(d));
const tx = testContract.mulDiv.callAsync(new BigNumber(a), n, new BigNumber(d));
return expect(tx).to.revertWith(expectedError);
});
@@ -506,6 +506,17 @@ blockchainTests('LibFixedMath unit tests', env => {
return expect(tx).to.revertWith(expectedError);
});
it('int(-1) * MIN_FIXED throws', async () => {
const [a, b] = [-1, MIN_FIXED_VALUE];
const expectedError = new FixedMathRevertErrors.BinOpError(
FixedMathRevertErrors.BinOpErrorCodes.MultiplicationOverflow,
a,
b,
);
const tx = testContract.mul.callAsync(new BigNumber(a), b);
return expect(tx).to.revertWith(expectedError);
});
it('MAX_FIXED * int(-1) == -MAX_FIXED / FIXED_1', async () => {
const [a, b] = [MAX_FIXED_VALUE, -1];
const r = await testContract.mul.callAsync(a, new BigNumber(b));