fix(dec-20-audit): [L11] Propose or Dispute a price from the zero address #2314
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Signed-off-by: David Adams <david@umaproject.org>
nicholaspai
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Dec 16, 2020
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mrice32
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Signed-off-by: David Adams david@umaproject.org
Motivation
The Optimistic oracle allows anyone to propose a price or dispute a proposal on behalf of the zero address. Since the state of the incentive mechanism is partially determined by whether the proposer or disputer addresses are non-zero, this won’t update the state machine, but it will set variables and emit events prematurely. For example, a client may incorrectly react to a DisputePrice event even though the dispute is not recognized by the oracle. Consider restricting the proposePriceFor and disputePriceFor function parameters to non-zero participants.
Summary
Adds 2 require statements in the appropriate functions and adds a tests to ensure calls fail when passing 0x0 address.