From 1e4891e48e7b6f022564e7409d15c3fdb65ec2ad Mon Sep 17 00:00:00 2001
From: "Ondrej Zajicek (work)" <santiago@crfreenet.org>
Date: Mon, 23 Nov 2015 11:13:40 +0100
Subject: [PATCH] Nest: Fix bug in device proto

If an interface address notification is received during device protocol
shutdown/restart, BIRD crashed.

Thanks to Wei Huang for the bugreport.
---
 sysdep/linux/netlink.c | 6 ++++--
 sysdep/unix/krt.c      | 2 +-
 sysdep/unix/krt.h      | 2 ++
 3 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/sysdep/linux/netlink.c b/sysdep/linux/netlink.c
index f2f60100..efbf41a6 100644
--- a/sysdep/linux/netlink.c
+++ b/sysdep/linux/netlink.c
@@ -1116,12 +1116,14 @@ nl_async_msg(struct nlmsghdr *h)
     case RTM_NEWLINK:
     case RTM_DELLINK:
       DBG("KRT: Received async link notification (%d)\n", h->nlmsg_type);
-      nl_parse_link(h, 0);
+      if (kif_proto)
+	nl_parse_link(h, 0);
       break;
     case RTM_NEWADDR:
     case RTM_DELADDR:
       DBG("KRT: Received async address notification (%d)\n", h->nlmsg_type);
-      nl_parse_addr(h, 0);
+      if (kif_proto)
+	nl_parse_addr(h, 0);
       break;
     default:
       DBG("KRT: Received unknown async notification (%d)\n", h->nlmsg_type);
diff --git a/sysdep/unix/krt.c b/sysdep/unix/krt.c
index 49bf9519..5e78586b 100644
--- a/sysdep/unix/krt.c
+++ b/sysdep/unix/krt.c
@@ -84,8 +84,8 @@ krt_io_init(void)
  *	Interfaces
  */
 
+struct kif_proto *kif_proto;
 static struct kif_config *kif_cf;
-static struct kif_proto *kif_proto;
 static timer *kif_scan_timer;
 static bird_clock_t kif_last_shot;
 
diff --git a/sysdep/unix/krt.h b/sysdep/unix/krt.h
index aea20102..d4a8717e 100644
--- a/sysdep/unix/krt.h
+++ b/sysdep/unix/krt.h
@@ -112,6 +112,8 @@ struct kif_proto {
   struct kif_state sys;		/* Sysdep state */
 };
 
+struct kif_proto *kif_proto;
+
 #define KIF_CF ((struct kif_config *)p->p.cf)
 
 struct proto_config * krt_init_config(int class);