[Bug libc/4181] New: inet6_opt_append is broken

["hugosantos at gmail dot com" <sourceware-bugzilla@sourceware.org>]

inet6_opt_append is broken and does not work with RFC 3542 supplied examples.

The problem is the following code:

  /* Now we can check whether the buffer is large enough.  */
  if (data_offset + npad + len > extlen)
    return -1;

Which should only be called if extbuf isn't NULL as any extlen is valid if
extbuf == NULL.

x = inet6_opt_init(NULL, 0);
x = inet6_opt_append(NULL, 0, x, OPT_FOO, size, align, NULL); /* should work but
fails */

-- 
           Summary: inet6_opt_append is broken
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: drepper at redhat dot com
        ReportedBy: hugosantos at gmail dot com
                CC: glibc-bugs at sources dot redhat dot com
 GCC build triplet: pc-linux-gnu
  GCC host triplet: pc-linux-gnu
GCC target triplet: pc-linux-gnu


http://sourceware.org/bugzilla/show_bug.cgi?id=4181

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