src/share/vm/runtime/arguments.cpp

*** 835,855 ****
      arg_len = strlen(argname);
    } else {
      arg_len = equal_sign - argname;
    }
  
    // Construct a string which consists only of the argument name without '+', '-', or '='.
!   char stripped_argname[256];
    strncpy(stripped_argname, argname, arg_len);
!   stripped_argname[arg_len] = '\0'; //strncpy doesn't null terminate.
  
    if (is_newly_obsolete(stripped_argname, &since)) {
      char version[256];
      since.to_string(version, sizeof(version));
      warning("ignoring option %s; support was removed in %s", stripped_argname, version);
      return true;
    }
  
    // For locked flags, report a custom error message if available.
    // Otherwise, report the standard unrecognized VM option.
    Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
    if (found_flag != NULL) {
--- 835,858 ----
      arg_len = strlen(argname);
    } else {
      arg_len = equal_sign - argname;
    }
  
+   // Only make the obsolete check for valid arguments.
+   if (arg_len <= BUFLEN) {
      // Construct a string which consists only of the argument name without '+', '-', or '='.
!     char stripped_argname[BUFLEN+1];
      strncpy(stripped_argname, argname, arg_len);
!     stripped_argname[arg_len] = '\0';  // strncpy may not null terminate.
  
      if (is_newly_obsolete(stripped_argname, &since)) {
        char version[256];
        since.to_string(version, sizeof(version));
        warning("ignoring option %s; support was removed in %s", stripped_argname, version);
        return true;
      }
+   }
  
    // For locked flags, report a custom error message if available.
    // Otherwise, report the standard unrecognized VM option.
    Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
    if (found_flag != NULL) {