Add missing NET_LOCK().

Found by jmc@

diff --git a/sys/net/if_tun.c b/sys/net/if_tun.c
index b672107..80eaabf 100644 (file)
--- a/sys/net/if_tun.c
+++ b/sys/net/if_tun.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: if_tun.c,v 1.176 2017/05/30 16:16:47 deraadt Exp $    */
+/*     $OpenBSD: if_tun.c,v 1.177 2017/06/03 11:58:54 mpi Exp $        */
 /*     $NetBSD: if_tun.c,v 1.24 1996/05/07 02:40:48 thorpej Exp $      */
 
 /*
@@ -837,7 +837,7 @@ tun_dev_write(struct tun_softc *tp, struct uio *uio, int ioflag)
        struct ifnet            *ifp;
        u_int32_t               *th;
        struct mbuf             *top, **mp, *m;
-       int                     error = 0, tlen;
+       int                     error = 0, tlen, s;
        size_t                  mlen;
 
        ifp = &tp->tun_if;
@@ -930,6 +930,8 @@ tun_dev_write(struct tun_softc *tp, struct uio *uio, int ioflag)
        ifp->if_ipackets++;
        ifp->if_ibytes += top->m_pkthdr.len;
 
+       NET_LOCK(s);
+
        switch (ntohl(*th)) {
        case AF_INET:
                ipv4_input(ifp, top);
@@ -941,9 +943,12 @@ tun_dev_write(struct tun_softc *tp, struct uio *uio, int ioflag)
 #endif
        default:
                m_freem(top);
-               return (EAFNOSUPPORT);
+               error = EAFNOSUPPORT;
+               break;
        }
 
+       NET_UNLOCK(s);
+
        return (error);
 }