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| author | Vasily Averin <vvs@parallels.com> | 2014-10-15 16:24:02 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-11-14 08:47:53 -0800 |
| commit | 9a8955adfba0821f5b354d400303436b6e4b2e13 (patch) | |
| tree | 737215e59e7249ceb99a346c7c378f2c863b2136 | |
| parent | 9744aac69371ecac7ac6bef8a7a4a65d4e949dfa (diff) | |
| download | linux-3.10-9a8955adfba0821f5b354d400303436b6e4b2e13.tar.gz linux-3.10-9a8955adfba0821f5b354d400303436b6e4b2e13.tar.bz2 linux-3.10-9a8955adfba0821f5b354d400303436b6e4b2e13.zip | |
ipv4: dst_entry leak in ip_send_unicast_reply()
[ Upstream commit 4062090e3e5caaf55bed4523a69f26c3265cc1d2 ]
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | net/ipv4/ip_output.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c index 5afbbbe03b0..22fa05e041e 100644 --- a/net/ipv4/ip_output.c +++ b/net/ipv4/ip_output.c @@ -1481,6 +1481,7 @@ void ip_send_unicast_reply(struct net *net, struct sk_buff *skb, __be32 daddr, struct sk_buff *nskb; struct sock *sk; struct inet_sock *inet; + int err; if (ip_options_echo(&replyopts.opt.opt, skb)) return; @@ -1517,8 +1518,13 @@ void ip_send_unicast_reply(struct net *net, struct sk_buff *skb, __be32 daddr, 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) @@ -1530,7 +1536,7 @@ void ip_send_unicast_reply(struct net *net, struct sk_buff *skb, __be32 daddr, 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); |