STATUS:
  the patch has been applied to proftpd on 2002-02-28.


this patch fixes a segfault that occures dirtree.c:build_dyn_conf()
as soon as an update attempt is made to an empty config subset.
it is against CVS as of 2001/12/27 12:32:56 GMT...

the segfault happens at
    _mergedown(*set,TRUE);
because set == NULL!


an attempt to explain:

suppose a ftpaccess is read, but nothing is added to the config_rec
which leaves config != NULL and config->subset == NULL. the next time
build_dyn_conf() is entered for the same directory (d != NULL and 
d->name equals fullpath) we still have a .ftpaccess (isfile != -1).
so we fall through to

      } else if(d->subset && d->subset->xas_list &&
                strcmp(d->name,fullpath) == 0 &&

this block is our last chance to have "set" set to sane value but it is
not entered because d->subset == NULL.

this patch moves the d->subset != NULL check one block down to where
it's actually needed, after "set" is valid.


regards,
  -lukas <lukas@edeal.de>