From: Howard Chu <hyc@symas.com>
Date: Wed, 3 Aug 2011 10:29:15 +0000 (-0700)
Subject: Fix free page re-use
X-Git-Tag: OPENLDAP_REL_ENG_2_4_27~148^2~147
X-Git-Url: https://git.sur5r.net/?a=commitdiff_plain;h=8211dd39603c16bb942a4a3361a55bfc89657263;p=openldap

Fix free page re-use
---

diff --git a/libraries/libmdb/mdb.c b/libraries/libmdb/mdb.c
index 5715eac78c..cb12757097 100644
--- a/libraries/libmdb/mdb.c
+++ b/libraries/libmdb/mdb.c
@@ -398,7 +398,9 @@ mdb_alloc_page(MDB_txn *txn, MDB_page *parent, unsigned int parent_idx, int num)
 		ULONG oldest = txn->mt_txnid - 2;
 		unsigned int i;
 		for (i=0; i<txn->mt_env->me_txns->mt_numreaders; i++) {
-			if (txn->mt_env->me_txns->mt_readers[i].mr_txnid < oldest)
+			ULONG mr = txn->mt_env->me_txns->mt_readers[i].mr_txnid;
+			if (!mr) continue;
+			if (mr < oldest)
 				oldest = txn->mt_env->me_txns->mt_readers[i].mr_txnid;
 		}
 		if (oldest > txn->mt_env->me_pghead->mo_txnid) {