From d50fff841031c502dc456b91d697306e483f1c8e Mon Sep 17 00:00:00 2001
From: Leonid Yuriev <leo@yuriev.ru>
Date: Wed, 9 Dec 2020 03:50:46 +0300
Subject: [PATCH] mdbx: minor refine `mdbx_page_check()`.

Change-Id: I325c20fe042635a0641cc24f5661408f3476139b
---
 src/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/core.c b/src/core.c
index f9c1063e..e558c3c5 100644
--- a/src/core.c
+++ b/src/core.c
@@ -15363,7 +15363,7 @@ static __cold int mdbx_page_check(MDBX_cursor *const mc,
   if (IS_OVERFLOW(mp)) {
     if (unlikely(mp->mp_pages < 1 && mp->mp_pages >= MAX_PAGENO / 2))
       return bad_page(mp, "invalid overflow n-pages (%u)\n", mp->mp_pages);
-    if (unlikely(mp->mp_pgno > mc->mc_txn->mt_next_pgno - mp->mp_pages))
+    if (unlikely(mp->mp_pgno + mp->mp_pages > mc->mc_txn->mt_next_pgno))
       return bad_page(mp, "overflow page beyond (%u) next-pgno\n",
                       mp->mp_pgno + mp->mp_pages);
     return MDBX_SUCCESS;