fix server_version memory management

src/MySQL_Generic_Connection.h

@@ -67,12 +67,7 @@ class MySQL_Connection : public MySQL_Packet
 
     virtual ~MySQL_Connection()
     {
-    	if (server_version)
-			{
-				MYSQL_LOGDEBUG("Free server_version");
-
-				free(server_version);
-			}
+	    this->close();
     };
 
     bool connect(const IPAddress& server, const uint16_t& port, char *user, char *password, char *db = NULL);

src/MySQL_Generic_Connection_Impl.h

@@ -153,7 +153,10 @@ bool MySQL_Connection::connect(const char *hostname, const uint16_t& port, char
   }
 
 	if (server_version)
-  	free(server_version); // don't need it anymore
+	{
+	  	free(server_version); // don't need it anymore
+		server_version = NULL;
+	}
 
   return returnVal;
 }
@@ -236,7 +239,10 @@ Connection_Result MySQL_Connection::connectNonBlocking(const char *hostname, con
   }
 
 	if (server_version)
-  	free(server_version); // don't need it anymore
+	{
+	  	free(server_version); // don't need it anymore
+		server_version = NULL;
+	}
 
   return returnVal;
 }

src/MySQL_Generic_Packet.h

@@ -94,6 +94,12 @@ class MySQL_Packet
 
 				free(buffer);
 			}
+	if (server_version)
+			{
+				MYSQL_LOGDEBUG("Free server_version");
+
+				free(server_version);
+			}
     };
 
     bool    complete_handshake(char *user, char *password);

src/MySQL_Generic_Packet_Impl.h

@@ -72,6 +72,7 @@
 MySQL_Packet::MySQL_Packet(Client *client_instance)
 {
   buffer = NULL;
+  server_version = NULL;
   client = client_instance;
 }
 
@@ -441,8 +442,15 @@ void MySQL_Packet::parse_handshake_packet()
     i++;
   } while (buffer[i - 1] != 0x00);
 
-  server_version = (char *) malloc(i - 5);
-  strncpy(server_version, (char *) &buffer[5], i - 5);
+  if (i>5)
+  {
+    server_version = (char *) malloc(i - 5);
+    if (server_version)
+    {
+       strncpy(server_version, (char *) &buffer[5], i - 5);
+       server_version[i-5-1]=0;
+    }
+  }
 
   // Capture the first 8 characters of seed
   i += 4; // Skip thread id