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blockchain: don't try to use hash check array after it's freed

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It's freed when we've synced past its end, but we might still
find an old chain somewhere
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moneromooo-monero 2018-02-10 11:25:00 +00:00
parent ed67e5c001
commit d6a0ae96c6
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1 changed files with 4 additions and 0 deletions
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src/cryptonote_core/blockchain.cpp
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@ -3753,6 +3753,10 @@ uint64_t Blockchain::prevalidate_block_hashes(uint64_t height, const std::list<c
if (height >= m_blocks_hash_of_hashes.size() * HASH_OF_HASHES_STEP)
return hashes.size();
// if we're getting old blocks, we might have jettisoned the hashes already
if (m_blocks_hash_check.empty())
return hashes.size();
// find hashes encompassing those block
size_t first_index = height / HASH_OF_HASHES_STEP;
size_t last_index = (height + hashes.size() - 1) / HASH_OF_HASHES_STEP;