NULLify a route pointer after calling rtfree(9).

This should theoretically be a no-op because we're freeing the PCB
right after, but it helps us debug a reference count problem found
by otto@.

ok mikeb@

diff --git a/sys/netinet/in_pcb.c b/sys/netinet/in_pcb.c
index a1ad89b..2e47cb7 100644 (file)
--- a/sys/netinet/in_pcb.c
+++ b/sys/netinet/in_pcb.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: in_pcb.c,v 1.209 2016/07/05 09:17:10 mpi Exp $        */
+/*     $OpenBSD: in_pcb.c,v 1.210 2016/07/19 14:49:46 mpi Exp $        */
 /*     $NetBSD: in_pcb.c,v 1.25 1996/02/13 23:41:53 christos Exp $     */
 
 /*
@@ -587,8 +587,10 @@ in_pcbdetach(struct inpcb *inp)
        so->so_pcb = 0;
        sofree(so);
        m_freem(inp->inp_options);
-       if (inp->inp_route.ro_rt)
+       if (inp->inp_route.ro_rt) {
                rtfree(inp->inp_route.ro_rt);
+               inp->inp_route.ro_rt = NULL;
+       }
 #ifdef INET6
        if (inp->inp_flags & INP_IPV6) {
                ip6_freepcbopts(inp->inp_outputopts6);