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authorVasily Averin <vvs@parallels.com>2014-10-15 16:24:02 +0400
committerDavid S. Miller <davem@davemloft.net>2014-10-17 23:30:12 +0400
commit4062090e3e5caaf55bed4523a69f26c3265cc1d2 (patch)
tree62d820ef254152a18577cfb2985851ca8e38f932
parent461b74c391c4ec9c766794e158508c357d8952e6 (diff)
downloadlinux-4062090e3e5caaf55bed4523a69f26c3265cc1d2.tar.xz
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>
-rw-r--r--net/ipv4/ip_output.c12
1 files changed, 9 insertions, 3 deletions
diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index e35b71289156..88e5ef2c7f51 100644
--- 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);