Ensure backupwallet fails when attempting to backup to source file

Previous behaviour was to destroy the wallet (to zero-length)

1 files changed, 5 insertions, 0 deletions

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;