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blockchain: avoid exception if asked for a block we do not have

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This can happen if a peer tries to obtain the next span from other
peers if that span is needed for not downloaded yet. Also if the
peer maliciously requests a non existent block hash.
This commit is contained in:
moneromooo-monero 2018-04-29 11:41:54 +01:00
parent 52f6b33890
commit b5cb1bc403
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1 changed files with 11 additions and 8 deletions
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13
src/cryptonote_core/blockchain.cpp
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@ -2032,15 +2032,18 @@ bool Blockchain::get_blocks(const t_ids_container& block_ids, t_blocks_container
{ {
try try
{ {
blocks.push_back(std::make_pair(m_db->get_block_blob(block_hash), block())); uint64_t height = 0;
if (m_db->block_exists(block_hash, &height))
{
blocks.push_back(std::make_pair(m_db->get_block_blob_from_height(height), block()));
if (!parse_and_validate_block_from_blob(blocks.back().first, blocks.back().second)) if (!parse_and_validate_block_from_blob(blocks.back().first, blocks.back().second))
{ {
LOG_ERROR("Invalid block"); LOG_ERROR("Invalid block: " << block_hash);
return false; blocks.pop_back();
missed_bs.push_back(block_hash);
} }
} }
catch (const BLOCK_DNE& e) else
{
missed_bs.push_back(block_hash); missed_bs.push_back(block_hash);
} }
catch (const std::exception& e) catch (const std::exception& e)