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core: prevent no-op code change for 7702 edge-cases #32915

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core: prevent no-op code change for 7702 edge-cases #32915

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core: prevent no-op code change when clearing a 7702 delegation on a…
jwasinger Oct 15, 2025
dd07018
variable name change
jwasinger Oct 15, 2025
3bea62d
goimports
jwasinger Oct 15, 2025
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12 changes: 9 additions & 3 deletions core/state_transition.go
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Original file line number Diff line number Diff line change
Expand Up @@ -617,16 +617,22 @@ func (st *stateTransition) applyAuthorization(auth *types.SetCodeAuthorization)
st.state.AddRefund(params.CallNewAccountGas - params.TxAuthTupleGas)
}

prevAuthority, isDelegated := types.ParseDelegation(st.state.GetCode(authority))

// Update nonce and account code.
st.state.SetNonce(authority, auth.Nonce+1, tracing.NonceChangeAuthorization)
if auth.Address == (common.Address{}) {
// Delegation to zero address means clear.
st.state.SetCode(authority, nil, tracing.CodeChangeAuthorizationClear)
if isDelegated {
st.state.SetCode(authority, nil, tracing.CodeChangeAuthorizationClear)
}
return nil
}

// Otherwise install delegation to auth.Address.
st.state.SetCode(authority, types.AddressToDelegation(auth.Address), tracing.CodeChangeAuthorization)
// install delegation to auth.Address if the delegation changed
if !isDelegated || auth.Address != prevAuthority {
st.state.SetCode(authority, types.AddressToDelegation(auth.Address), tracing.CodeChangeAuthorization)
}

return nil
}
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