ipv4: dst_entry leak in ip_send_unicast_reply()

ip_setup_cork() called inside ip_append_data() steals dst entry from rt to cork
and in case errors in __ip_append_data() nobody frees stolen dst entry

Fixes: 2e77d89b2fa8 ("net: avoid a pair of dst_hold()/dst_release() in ip_append_data()")
Signed-off-by: Vasily Averin <vvs@parallels.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index e35b712..88e5ef2 100644 (file)
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -1535,6 +1535,7 @@ void ip_send_unicast_reply(struct net *net, struct sk_buff *skb,
        struct sk_buff *nskb;
        struct sock *sk;
        struct inet_sock *inet;
+       int err;
 
        if (__ip_options_echo(&replyopts.opt.opt, skb, sopt))
                return;
@@ -1574,8 +1575,13 @@ void ip_send_unicast_reply(struct net *net, struct sk_buff *skb,
        sock_net_set(sk, net);
        __skb_queue_head_init(&sk->sk_write_queue);
        sk->sk_sndbuf = sysctl_wmem_default;
-       ip_append_data(sk, &fl4, ip_reply_glue_bits, arg->iov->iov_base, len, 0,
-                      &ipc, &rt, MSG_DONTWAIT);
+       err = ip_append_data(sk, &fl4, ip_reply_glue_bits, arg->iov->iov_base,
+                            len, 0, &ipc, &rt, MSG_DONTWAIT);
+       if (unlikely(err)) {
+               ip_flush_pending_frames(sk);
+               goto out;
+       }
+
        nskb = skb_peek(&sk->sk_write_queue);
        if (nskb) {
                if (arg->csumoffset >= 0)
@@ -1587,7 +1593,7 @@ void ip_send_unicast_reply(struct net *net, struct sk_buff *skb,
                skb_set_queue_mapping(nskb, skb_get_queue_mapping(skb));
                ip_push_pending_frames(sk, &fl4);
        }
-
+out:
        put_cpu_var(unicast_sock);
 
        ip_rt_put(rt);