EOVERFLOW in fseek()

[Sebastian Huber <sebastian dot huber at embedded-brains dot de>]

Hi,

in "newlib/libc/stdio/fseek.c" we have:

[...]
  /*
   * We are reading; we can try to optimise.
   * Figure out where we are going and where we are now.
   */

  if (whence == SEEK_SET)
    target = offset;
  else
    {
#ifdef __USE_INTERNAL_STAT64
      if (_fstat64_r (ptr, fp->_file, &st))
#else
      if (_fstat_r (ptr, fp->_file, &st))
#endif
	goto dumb;
      target = st.st_size + offset;
    }
  if ((long)target != target)
    {
      ptr->_errno = EOVERFLOW;
      _newlib_flockfile_exit (fp);
      return EOF;
    }
[...]

In "target = st.st_size + offset" we may have a signed integer overflow. 
Shouldn't this lead to an EOVERFLOW error?

--
Sebastian Huber, embedded brains GmbH

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