lmdb: don't begin query if we have a bad lmdb env

In some weird multithreaded situations after we close the database, this can be an issue. Signed-off-by: William Casarin <[email protected]>
damus-io · Dec 12, 2023 · b00f9f0 · b00f9f0
1 parent 39f36f9
commit b00f9f0
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/nostrdb.c b/nostrdb.c
@@ -864,6 +864,8 @@ static int _ndb_begin_query(struct ndb *ndb, struct ndb_txn *txn, int flags)
 {
 	txn->lmdb = &ndb->lmdb;
 	MDB_txn **mdb_txn = (MDB_txn **)&txn->mdb_txn;
+	if (!txn->lmdb->env)
+		return 0;
 	return mdb_txn_begin(txn->lmdb->env, NULL, flags, mdb_txn) == 0;
 }