l2tp: don't overwrite source address in l2tp_ip_bind()

[karo-tx-linux.git] / net / l2tp / l2tp_ip.c

diff --git a/net/l2tp/l2tp_ip.c b/net/l2tp/l2tp_ip.c
index b56be1452f8ea1212b2b63fbd1580c861a1b90fc..585d93ecee2daad47505863f2ff84ae04248286f 100644 (file)
--- a/net/l2tp/l2tp_ip.c
+++ b/net/l2tp/l2tp_ip.c
@@ -271,7 +271,8 @@ static int l2tp_ip_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
            chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST)
                goto out;
 
-       inet->inet_rcv_saddr = inet->inet_saddr = addr->l2tp_addr.s_addr;
+       if (addr->l2tp_addr.s_addr)
+               inet->inet_rcv_saddr = inet->inet_saddr = addr->l2tp_addr.s_addr;
        if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
                inet->inet_saddr = 0;  /* Use device */
        sk_dst_reset(sk);