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Merge pull request #813

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70c8656 blockchain: add missing overflow check for already generated coins (moneromooo-monero)
d6fd6be blockchain: update cumulative block limit when popping a block (moneromooo-monero)
This commit is contained in:
Riccardo Spagni 2016-04-26 18:03:31 +02:00
commit fbfb8f46a9
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1 changed files with 6 additions and 1 deletions
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7
src/cryptonote_core/blockchain.cpp
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@ -498,6 +498,7 @@ block Blockchain::pop_block_from_blockchain()
}
}
}
update_next_cumulative_size_limit();
m_tx_pool.on_blockchain_dec(m_db->height()-1, get_tail_id());
return popped_block;
@ -2712,7 +2713,11 @@ leave:
// populate various metadata about the block to be stored alongside it.
block_size = cumulative_block_size;
cumulative_difficulty = current_diffic;
already_generated_coins = already_generated_coins + base_reward;
// In the "tail" state when the minimum subsidy (implemented in get_block_reward) is in effect, the number of
// coins will eventually exceed MONEY_SUPPLY and overflow a uint64. To prevent overflow, cap already_generated_coins
// at MONEY_SUPPLY. already_generated_coins is only used to compute the block subsidy and MONEY_SUPPLY yields a
// subsidy of 0 under the base formula and therefore the minimum subsidy >0 in the tail state.
already_generated_coins = base_reward < (MONEY_SUPPLY-already_generated_coins) ? already_generated_coins + base_reward : MONEY_SUPPLY;
if(m_db->height())
cumulative_difficulty += m_db->get_block_cumulative_difficulty(m_db->height() - 1);