Use calldatacopy for selector retrieval to avoid access out of bounds for calldata.

2023-10-03 13:03:40 +00:00 · 2020-06-12 13:02:57 -05:00
parent f4fc095ae0
commit c8d95d601e
4 changed files with 250 additions and 84 deletions
@@ -583,7 +583,9 @@ string IRGenerator::dispatchRoutine(ContractDefinition const& _contract)
 	Whiskers t(R"X(
 		if iszero(lt(calldatasize(), 4))
 		{
-			let selector := <shr224>(calldataload(0))
+			mstore(0, 0)
+			calldatacopy(28, 0, 4)
+			let selector := mload(0)
 			switch selector
 			<#cases>
 			case <functionSelector>