From 5d465e396249a0e2cc60b16984a2bdbe4c8993c3 Mon Sep 17 00:00:00 2001
From: Tomas van der Wansem <tomas@tomasvdw.nl>
Date: Thu, 21 Sep 2017 00:10:46 +0200
Subject: Ensure backupwallet fails when attempting to backup to source file

Previous behaviour was to destroy the wallet (to zero-length)
---
 src/wallet/db.cpp | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'src/wallet/db.cpp')

diff --git a/src/wallet/db.cpp b/src/wallet/db.cpp
index d66ba48421..d49cd82340 100644
--- a/src/wallet/db.cpp
+++ b/src/wallet/db.cpp
@@ -672,6 +672,11 @@ bool CWalletDBWrapper::Backup(const std::string& strDest)
                     pathDest /= strFile;
 
                 try {
+                    if (fs::equivalent(pathSrc, pathDest)) {
+                        LogPrintf("cannot backup to wallet source file %s\n", pathDest.string());
+                        return false;
+                    }
+
                     fs::copy_file(pathSrc, pathDest, fs::copy_option::overwrite_if_exists);
                     LogPrintf("copied %s to %s\n", strFile, pathDest.string());
                     return true;
-- 
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