Bug #18053212 MYSQL_GET_SERVER_VERSION() CALL WITHOUT A VALID CONNECTION RESULTS IN SEG FAULT

When there is no connection mysql_get_server_version() will return 0
and report CR_COMMANDS_OUT_OF_SYNC error.

sql-common/client.c

@@ -4230,17 +4230,27 @@ const char * STDCALL mysql_error(MYSQL *mysql)
 
   RETURN
    Signed number > 323000
+   Zero if there is no connection
 */
 
 ulong STDCALL
 mysql_get_server_version(MYSQL *mysql)
 {
-  uint major, minor, version;
+  ulong major= 0, minor= 0, version= 0;
+
+  if (mysql->server_version)
+  {
     char *pos= mysql->server_version, *end_pos;
-  major=   (uint) strtoul(pos, &end_pos, 10);	pos=end_pos+1;
-  minor=   (uint) strtoul(pos, &end_pos, 10);	pos=end_pos+1;
-  version= (uint) strtoul(pos, &end_pos, 10);
-  return (ulong) major*10000L+(ulong) (minor*100+version);
+    major=   strtoul(pos, &end_pos, 10);	pos=end_pos+1;
+    minor=   strtoul(pos, &end_pos, 10);	pos=end_pos+1;
+    version= strtoul(pos, &end_pos, 10);
+  }
+  else
+  {
+    set_mysql_error(mysql, CR_COMMANDS_OUT_OF_SYNC, unknown_sqlstate);
+  }
+
+  return major*10000 + minor*100 + version;
 }