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+# First Flight #3: Thunder Loan - Findings Report
+
+# Table of contents
+- ## [Contest Summary](#contest-summary)
+- ## [Results Summary](#results-summary)
+- ## High Risk Findings
+    - ### [H-01. Mismatch storage layout for upgradeable logic contract](#H-01)
+
+
+
+
+# <a id='contest-summary'></a>Contest Summary
+
+### Sponsor: First Flight #3
+
+### Dates: Nov 1st, 2023 - Nov 8th, 2023
+
+[See more contest details here](https://www.codehawks.com/contests/clocopz26004rkx08q1n61wnz)
+
+# <a id='results-summary'></a>Results Summary
+
+### Number of findings:
+   - High: 1
+   - Medium: 0
+   - Low: 0
+
+
+# High Risk Findings
+
+## <a id='H-01'></a>[H-01] Mismatch storage layout for upgradeable logic contract            
+
+### Relevant GitHub Links
+	
+https://github.com/Cyfrin/2023-11-Thunder-Loan/blob/8539c83865eb0d6149e4d70f37a35d9e72ac7404/src/upgradedProtocol/ThunderLoanUpgraded.sol#L96
+
+## Summary
+
+In proxy pattern, the upgraded storage layout should follow the previous one. If not, it will lead to storage collision and several sensitive data will be override.
+
+## Vulnerability Details
+
+In the `ThunderLoanUpgraded.sol` contract, the storage layout is the following format:
+
+```
+mapping(IERC20 => AssetToken) public s_tokenToAssetToken;
+uint256 private s_flashLoanFee;
+mapping(IERC20 token => bool currentlyFlashLoaning) private s_currentlyFlashLoaning;
+```
+
+which is not coherent to the storage layout of `ThunderLoan.sol`
+
+```
+mapping(IERC20 => AssetToken) public s_tokenToAssetToken;
+uint256 private s_feePrecision;
+uint256 private s_flashLoanFee;
+mapping(IERC20 token => bool currentlyFlashLoaning) private s_currentlyFlashLoaning;
+```
+
+If logic contract is updated, the storage slot that stores the `s_flashLoanFee` will be overrided by `s_currentlyFlashLoaning`.
+
+## Impact
+
+The value of `s_flashLoanFee` will be incorrect and lead to wrong calculation.
+
+## Tools Used
+
+Manual Review
+
+## Recommendations
+
+Coherent to the previous storage layout and avoid adding or deleting new state variables.
+
+
+		
+
+
+
+
+