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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 08:59:44 -0800 |
| commit | 7584945280883f5e414b1038c2af0e8daf51c986 (patch) | |
| tree | a985e6b118fd654d9bbd87db39fe76677da92fc3 /net | |
| parent | abe640984aa492652232b65d3579361cf6d461f5 (diff) | |
| download | kernel-common-7584945280883f5e414b1038c2af0e8daf51c986.tar.gz kernel-common-7584945280883f5e414b1038c2af0e8daf51c986.tar.bz2 kernel-common-7584945280883f5e414b1038c2af0e8daf51c986.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>
Diffstat (limited to 'net')
| -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 ed88d781248f..844323b6cfb9 100644 --- a/net/ipv4/ip_output.c +++ b/net/ipv4/ip_output.c @@ -1487,6 +1487,7 @@ 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; @@ -1525,8 +1526,13 @@ 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) @@ -1538,7 +1544,7 @@ 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); |