 logger_get_mask_expanded (struct t_gui_buffer *buffer, const char *mask)
 {
    char *mask2, *mask_decoded, *mask_decoded2, *mask_decoded3, *mask_decoded4;
    char *mask_decoded5;
     const char *dir_separator;
     int length;
     time_t seconds;
     struct tm *date_tmp;
 
     mask2 = NULL;
    mask_decoded = NULL;
    mask_decoded2 = NULL;
    mask_decoded3 = NULL;
    mask_decoded4 = NULL;
    mask_decoded5 = NULL;
 
     dir_separator = weechat_info_get ("dir_separator", "");
     if (!dir_separator)
         return NULL;
 
     /*
      * we first replace directory separator (commonly '/') by \01 because
      * buffer mask can contain this char, and will be replaced by replacement
      * char ('_' by default)
      */
    mask2 = weechat_string_replace (mask, dir_separator, "\01");
    if (!mask2)
         goto end;
 
    mask_decoded = weechat_buffer_string_replace_local_var (buffer, mask2);
    if (!mask_decoded)
         goto end;
 
    mask_decoded2 = weechat_string_replace (mask_decoded,
                                            dir_separator,
                                            weechat_config_string (logger_config_file_replacement_char));
    if (!mask_decoded2)
         goto end;
 
 #ifdef __CYGWIN__
    mask_decoded3 = weechat_string_replace (mask_decoded2, "\\",
                                            weechat_config_string (logger_config_file_replacement_char));
 #else
    mask_decoded3 = strdup (mask_decoded2);
 #endif /* __CYGWIN__ */
    if (!mask_decoded3)
         goto end;
 
     /* restore directory separator */
    mask_decoded4 = weechat_string_replace (mask_decoded3,
                                            "\01", dir_separator);
    if (!mask_decoded4)
        goto end;
    /* replace date/time specifiers in mask */
    length = strlen (mask_decoded4) + 256 + 1;
    mask_decoded5 = malloc (length);
    if (!mask_decoded5)
         goto end;
    seconds = time (NULL);
    date_tmp = localtime (&seconds);
    mask_decoded5[0] = '\0';
    strftime (mask_decoded5, length - 1, mask_decoded4, date_tmp);
 
     /* convert to lower case? */
     if (weechat_config_boolean (logger_config_file_name_lower_case))
        weechat_string_tolower (mask_decoded5);
 
     if (weechat_logger_plugin->debug)
     {
        weechat_printf_date_tags (NULL, 0, "no_log",
                                  "%s: buffer = \"%s\", mask = \"%s\", "
                                   "decoded mask = \"%s\"",
                                   LOGGER_PLUGIN_NAME,
                                   weechat_buffer_get_string (buffer, "name"),
                                  mask, mask_decoded5);
     }
 
 end:
     if (mask2)
         free (mask2);
    if (mask_decoded)
        free (mask_decoded);
    if (mask_decoded2)
        free (mask_decoded2);
    if (mask_decoded3)
        free (mask_decoded3);
    if (mask_decoded4)
        free (mask_decoded4);
    return mask_decoded5;
 }

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.