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fix kLast bug when fee goes on -> off -> on

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This commit is contained in:
Noah Zinsmeister
2020-01-31 11:10:06 -05:00
parent 1a2d91c440
commit 064aefb04c
1 changed files with 4 additions and 2 deletions
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6
contracts/UniswapV2Exchange.sol
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@ -79,9 +79,9 @@ contract UniswapV2Exchange is IUniswapV2Exchange, UniswapV2ERC20 {
function _mintFee(uint112 _reserve0, uint112 _reserve1) private returns (bool feeOn) { function _mintFee(uint112 _reserve0, uint112 _reserve1) private returns (bool feeOn) {
address feeTo = IUniswapV2Factory(factory).feeTo(); address feeTo = IUniswapV2Factory(factory).feeTo();
feeOn = feeTo != address(0); feeOn = feeTo != address(0);
uint _kLast = kLast; // gas savings
if (feeOn) { if (feeOn) {
uint _kLast = kLast; // gas savings if (_kLast != 0) {
if (_kLast > 0) {
uint rootK = Math.sqrt(uint(_reserve0).mul(_reserve1)); uint rootK = Math.sqrt(uint(_reserve0).mul(_reserve1));
uint rootKLast = Math.sqrt(_kLast); uint rootKLast = Math.sqrt(_kLast);
if (rootK > rootKLast) { if (rootK > rootKLast) {
@ -91,6 +91,8 @@ contract UniswapV2Exchange is IUniswapV2Exchange, UniswapV2ERC20 {
if (liquidity > 0) _mint(feeTo, liquidity); if (liquidity > 0) _mint(feeTo, liquidity);
} }
} }
} else if (_kLast != 0) {
kLast = 0;
} }
} }