From 0350fc41f8a3b362e50fd3b4caa4c40a486b76f9 Mon Sep 17 00:00:00 2001
From: Leonid Yuriev <leo@yuriev.ru>
Date: Thu, 19 Dec 2019 19:49:58 +0300
Subject: [PATCH] mdbx: clean copy for undo meta.

Change-Id: I2abc1d701dc52caa268210489aa27803fd7a2c3b
---
 src/elements/core.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/elements/core.c b/src/elements/core.c
index 0265223d..230ff11a 100644
--- a/src/elements/core.c
+++ b/src/elements/core.c
@@ -7679,6 +7679,7 @@ static int mdbx_sync_locked(MDBX_env *env, unsigned flags,
       }
     }
   } else {
+    const MDBX_meta undo_meta = *target;
     const mdbx_filehandle_t fd = (env->me_dsync_fd != INVALID_HANDLE_VALUE)
                                      ? env->me_dsync_fd
                                      : env->me_lazy_fd;
@@ -7689,7 +7690,7 @@ static int mdbx_sync_locked(MDBX_env *env, unsigned flags,
       mdbx_debug("%s", "write failed, disk error?");
       /* On a failure, the pagecache still contains the new data.
        * Try write some old data back, to prevent it from being used. */
-      mdbx_pwrite(fd, (void *)target, sizeof(MDBX_meta),
+      mdbx_pwrite(fd, &undo_meta, sizeof(MDBX_meta),
                   (uint8_t *)target - env->me_map);
       goto fail;
     }