From 1b45a7f19dc38d9ec1b5f580e43e37dda892eb58 Mon Sep 17 00:00:00 2001
From: CryptoManiac <balthazar@yandex.ru>
Date: Fri, 4 Mar 2016 23:19:59 +0300
Subject: [PATCH] Check for NULL values properly.

---
 src/db.cpp |   12 ++++++++----
 1 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/src/db.cpp b/src/db.cpp
index 757a18e..68d19fe 100644
--- a/src/db.cpp
+++ b/src/db.cpp
@@ -397,7 +397,6 @@ bool CDB::Rewrite(const string& strFile, const char* pszSkip)
 
                     Dbc* pcursor = db.GetCursor();
                     if (pcursor) {
-                        size_t pszSkipLen = strlen(pszSkip);
                         while (fSuccess)
                         {
                             CDataStream ssKey(SER_DISK, CLIENT_VERSION);
@@ -414,9 +413,14 @@ bool CDB::Rewrite(const string& strFile, const char* pszSkip)
                                 fSuccess = false;
                                 break;
                             }
-                            if (pszSkip &&
-                                strncmp(&ssKey[0], pszSkip, std::min(ssKey.size(), pszSkipLen)) == 0)
-                                continue;
+
+                            if (pszSkip != NULL)
+                            {
+                                size_t pszSkipLen = strlen(pszSkip);
+                                if (strncmp(&ssKey[0], pszSkip, std::min(ssKey.size(), pszSkipLen)) == 0)
+                                    continue;
+                            }
+
                             if (strncmp(&ssKey[0], "\x07version", 8) == 0)
                             {
                                 // Update version:
-- 
1.7.1