MX sort bug

[T.Kobayashi <tk...@ii...>]

Hi.

I found sid-milter's bug in MX priority sorting (version 0.2.4).
This bug causes lack of one record which is result of MX query.

Affected case is below(any record match '-all'):
example.com	IN	TXT	v=spf1 +mx -all
example.com	IN	MX   10	mx1.example.com

Fix is below:
<sid-filter/sid-filter.c:1073>
  /* sort MX list */
  for (n = 0; n < nmx; n++)
  {
-    if (prec[n] > prec[n + 1])
+    if((n + 1 < nmx) && prec[n] > prec[n + 1])
     {
        m = prec[n];
        prec[n] = prec[n + 1];
        prec[n + 1] = m;

        sm_strlcpy(qname, mxes[n], sizeof qname);
        sm_strlcpy(mxes[n], mxes[n + 1],
              sizeof mxes[n]);
        sm_strlcpy(mxes[n + 1], qname,
              sizeof mxes[n + 1]);
      }
   }


-- 
T.Kobayashi <tk...@ii...>