From e4457f2f681f66963c8ee1c37f689aa33d964d6f Mon Sep 17 00:00:00 2001
From: Jan-Philipp Litza <janphilipp@litza.de>
Date: Fri, 9 Dec 2016 20:13:35 +0100
Subject: [PATCH] gluon-radv-filterd: Fix use-after-free when best router
 expires

---
 package/gluon-radv-filterd/src/gluon-radv-filterd.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/package/gluon-radv-filterd/src/gluon-radv-filterd.c b/package/gluon-radv-filterd/src/gluon-radv-filterd.c
index 8b702f57..3e089529 100644
--- a/package/gluon-radv-filterd/src/gluon-radv-filterd.c
+++ b/package/gluon-radv-filterd/src/gluon-radv-filterd.c
@@ -312,6 +312,8 @@ static void expire_routers() {
 		if (router->eol < now) {
 			DEBUG_MSG("router " F_MAC " expired", F_MAC_VAR(router->src));
 			*prev_ptr = router->next;
+			if (G.best_router == router)
+				G.best_router = NULL;
 			free(router);
 		} else {
 			prev_ptr = &router->next;