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Auction:purchaseArbitrageTokens gas optimization #147

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code423n4 opened this issue Nov 29, 2021 · 1 comment
Open

Auction:purchaseArbitrageTokens gas optimization #147

code423n4 opened this issue Nov 29, 2021 · 1 comment
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bug Something isn't working G (Gas Optimization) sponsor confirmed Sponsor agrees this is a problem and intends to fix it (OK to use w/ "disagree with severity")

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@code423n4
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GiveMeTestEther

Vulnerability details

Impact

L209 nextCommitmentId = nextCommitmentId + 1; can be removed and
L202 can be changed to nextCommitmentId++; to save a SLOAD

Proof of Concept

https://github.com/code-423n4/2021-11-malt/blob/c3a204a2c0f7c653c6c2dda9f4563fd1dc1cecf3/src/contracts/Auction.sol#L177

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Recommended Mitigation Steps
@code423n4 code423n4 added bug Something isn't working G (Gas Optimization) labels Nov 29, 2021
code423n4 added a commit that referenced this issue Nov 29, 2021
@code423n4
GiveMeTestEther issue #147
5c05a38
@0xScotch 0xScotch added the sponsor confirmed Sponsor agrees this is a problem and intends to fix it (OK to use w/ "disagree with severity") label Dec 9, 2021
This was referenced Dec 9, 2021
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@GalloDaSballo
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Storing in memory would probably be simplest, alternatively as the warden suggested, you could post increment in the event and avoid a second SLOAD

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bug Something isn't working G (Gas Optimization) sponsor confirmed Sponsor agrees this is a problem and intends to fix it (OK to use w/ "disagree with severity")
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@GalloDaSballo @0xScotch @code423n4