Merge pull request #813
70c8656
blockchain: add missing overflow check for already generated coins (moneromooo-monero)d6fd6be
blockchain: update cumulative block limit when popping a block (moneromooo-monero)
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fbfb8f46a9
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@ -498,6 +498,7 @@ block Blockchain::pop_block_from_blockchain()
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}
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}
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}
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update_next_cumulative_size_limit();
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m_tx_pool.on_blockchain_dec(m_db->height()-1, get_tail_id());
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return popped_block;
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@ -2712,7 +2713,11 @@ leave:
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// populate various metadata about the block to be stored alongside it.
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block_size = cumulative_block_size;
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cumulative_difficulty = current_diffic;
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already_generated_coins = already_generated_coins + base_reward;
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// In the "tail" state when the minimum subsidy (implemented in get_block_reward) is in effect, the number of
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// coins will eventually exceed MONEY_SUPPLY and overflow a uint64. To prevent overflow, cap already_generated_coins
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// at MONEY_SUPPLY. already_generated_coins is only used to compute the block subsidy and MONEY_SUPPLY yields a
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// subsidy of 0 under the base formula and therefore the minimum subsidy >0 in the tail state.
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already_generated_coins = base_reward < (MONEY_SUPPLY-already_generated_coins) ? already_generated_coins + base_reward : MONEY_SUPPLY;
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if(m_db->height())
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cumulative_difficulty += m_db->get_block_cumulative_difficulty(m_db->height() - 1);
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