From 49fa9b9c35a25e11de6feda82b336ad1aa516102 Mon Sep 17 00:00:00 2001
From: Leonid Yuriev <leo@yuriev.ru>
Date: Mon, 4 Feb 2019 00:08:56 +0300
Subject: [PATCH] mdbx: fix handling MDBX_APPENDDUP mode.

Change-Id: I36de2a8dcab5126dab3857a7840ab3904a1d19c8
---
 src/mdbx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/mdbx.c b/src/mdbx.c
index 486ff754..9ccdb8aa 100644
--- a/src/mdbx.c
+++ b/src/mdbx.c
@@ -8300,7 +8300,7 @@ int mdbx_cursor_put(MDBX_cursor *mc, MDBX_val *key, MDBX_val *data,
         if (rc > 0) {
           rc = MDBX_NOTFOUND;
           mc->mc_ki[mc->mc_top]++;
-        } else {
+        } else if (unlikely(rc < 0 || (flags & MDBX_APPENDDUP) == 0)) {
           /* new key is <= last key */
           rc = MDBX_EKEYMISMATCH;
         }