m_copy can return NULL, so check for it

problem found by "Adrian M. Whatley" <amw> and "Stephan A. Rickauer"
<stephan.rickauer>, both @ni.phys.ethz.ch
fix by me, ok mpf

diff --git a/sys/net/pf.c b/sys/net/pf.c
index e21bf9f..6afcea3 100644 (file)
--- a/sys/net/pf.c
+++ b/sys/net/pf.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: pf.c,v 1.609 2008/07/10 07:41:21 djm Exp $ */
+/*     $OpenBSD: pf.c,v 1.610 2008/07/14 13:29:45 henning Exp $ */
 
 /*
  * Copyright (c) 2001 Daniel Hartmeier
@@ -1819,7 +1819,9 @@ pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af,
 {
        struct mbuf     *m0;
 
-       m0 = m_copy(m, 0, M_COPYALL);
+       if ((m0 = m_copy(m, 0, M_COPYALL)) == NULL)
+               return;
+
        m0->m_pkthdr.pf.flags |= PF_TAG_GENERATED;
 
        if (r->rtableid >= 0)