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db_lmdb: fix race crash using a stale cursor 

If a db resize happened, the txpool meta cursor might be stale,
and was not being renewed when necessary.
It would cause this SEGSEGV:

in mdb_cursor_set ()
in mdb_cursor_get ()
in cryptonote::BlockchainLMDB::get_txpool_tx_blob(crypto::hash const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&, cryptonote::relay_category) const ()
in cryptonote::tx_memory_pool::get_transaction(crypto::hash const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&, cryptonote::relay_category) const ()
in cryptonote::t_cryptonote_protocol_handler<cryptonote::core>::handle_notify_new_fluffy_block(int, epee::misc_utils::struct_init<cryptonote::NOTIFY_NEW_FLUFFY_BLOCK::request_t>&, cryptonote::cryptonote_connection_context&) ()
This commit is contained in:
moneromooo-monero 2020-03-12 00:53:34 +00:00
parent 4764d18eeb
commit ec01077720
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GPG Key ID: 686F07454D6CEFC3
1 changed files with 1 additions and 0 deletions
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src/blockchain_db/lmdb/db_lmdb.cpp
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@ -1915,6 +1915,7 @@ bool BlockchainLMDB::get_txpool_tx_blob(const crypto::hash& txid, cryptonote::bl
// if filtering, make sure those requirements are met before copying blob // if filtering, make sure those requirements are met before copying blob
if (tx_category != relay_category::all) if (tx_category != relay_category::all)
{ {
RCURSOR(txpool_meta)
auto result = mdb_cursor_get(m_cur_txpool_meta, &k, &v, MDB_SET); auto result = mdb_cursor_get(m_cur_txpool_meta, &k, &v, MDB_SET);
if (result == MDB_NOTFOUND) if (result == MDB_NOTFOUND)
return false; return false;