Index: if.c
===================================================================
RCS file: /cvs/src/sys/net/if.c,v
retrieving revision 1.372
diff -u -p -r1.372 if.c
--- if.c	11 Sep 2015 09:15:56 -0000	1.372
+++ if.c	11 Sep 2015 12:26:56 -0000
@@ -405,7 +405,7 @@ if_alloc_sadl(struct ifnet *ifp)
 void
 if_free_sadl(struct ifnet *ifp)
 {
-	free(ifp->if_sadl, M_IFADDR, 0);
+	free(ifp->if_sadl, M_IFADDR, sdl->sdl_len);
 	ifp->if_sadl = NULL;
 }