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Subject[PATCH 3.2 24/27] ipv4: dst_entry leak in ip_send_unicast_reply()
3.2.66-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Vasily Averin <vvs@parallels.com>

commit 4062090e3e5caaf55bed4523a69f26c3265cc1d2 upstream.

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>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
net/ipv4/ip_output.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)

--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -1472,6 +1472,7 @@ void ip_send_reply(struct sock *sk, stru
struct ipcm_cookie ipc;
struct flowi4 fl4;
struct rtable *rt = skb_rtable(skb);
+ int err;

if (ip_options_echo(&replyopts.opt.opt, skb))
return;
@@ -1509,8 +1510,13 @@ void ip_send_reply(struct sock *sk, stru
sk->sk_priority = skb->priority;
sk->sk_protocol = ip_hdr(skb)->protocol;
sk->sk_bound_dev_if = arg->bound_dev_if;
- 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;
+ }
+
if ((skb = skb_peek(&sk->sk_write_queue)) != NULL) {
if (arg->csumoffset >= 0)
*((__sum16 *)skb_transport_header(skb) +
@@ -1519,7 +1525,7 @@ void ip_send_reply(struct sock *sk, stru
skb->ip_summed = CHECKSUM_NONE;
ip_push_pending_frames(sk, &fl4);
}
-
+out:
bh_unlock_sock(sk);

ip_rt_put(rt);


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