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Unnecessary SLOADs in Auction #33

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code423n4 opened this issue Oct 9, 2021 · 1 comment
Open

Unnecessary SLOADs in Auction #33

code423n4 opened this issue Oct 9, 2021 · 1 comment
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bug Warden finding 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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pants

Vulnerability details

The functions Auction.bondForRebalance(), Auction.settleAuction(), Auction.bondBurn() and Auction.withdrawBounty() read values from storage multiple times instead of caching them in local variables:

  • Auction.bondForRebalance() reads bondAmount twice.
  • Auction.settleAuction() reads bondBlock twice, basket 8 times and factory twice.
  • Auction.bondBurn() reads basket twice and bondAmount twice.
  • Auction.withdrawBounty() reads bounty.token twice and bounty.amount twice.

Impact

Storage reads are much more expensive than reading local variables.

Tool Used

Manual code review.

Recommended Mitigation Steps

Read these values from storage once, cache them in local variables and then read them again from the local variables.
code423n4 added a commit that referenced this issue Oct 9, 2021
@code423n4
pants issue #33
7b2f0d7
@frank-beard frank-beard added the sponsor confirmed Sponsor agrees this is a problem and intends to fix it (OK to use w/ "disagree with severity") label Nov 6, 2021
@GalloDaSballo
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Agree that caching these values in memory would save gas
I appreciate the warden listing the isntances

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bug Warden finding 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 @code423n4 @frank-beard