diff options
| author | Eric Dumazet <edumazet@google.com> | 2016-08-17 09:56:46 -0700 |
|---|---|---|
| committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2016-08-18 00:51:13 +0200 |
| commit | dcbe35909c8426e1ace74b4b99c4cb403cdaca89 (patch) | |
| tree | 23e69e6646920b3c7a14db09d3db696e83922708 /net/netfilter/xt_TPROXY.c | |
| parent | aca300183ed4f723837f6619facff0890c46d313 (diff) | |
netfilter: tproxy: properly refcount tcp listeners
inet_lookup_listener() and inet6_lookup_listener() no longer
take a reference on the found listener.
This minimal patch adds back the refcounting, but we might do
this differently in net-next later.
Fixes: 3b24d854cb35 ("tcp/dccp: do not touch listener sk_refcnt under synflood")
Reported-and-tested-by: Denys Fedoryshchenko <nuclearcat@nuclearcat.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net/netfilter/xt_TPROXY.c')
| -rw-r--r-- | net/netfilter/xt_TPROXY.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/net/netfilter/xt_TPROXY.c b/net/netfilter/xt_TPROXY.c index 7f4414d26a66..663c4c3c9072 100644 --- a/net/netfilter/xt_TPROXY.c +++ b/net/netfilter/xt_TPROXY.c @@ -127,6 +127,8 @@ nf_tproxy_get_sock_v4(struct net *net, struct sk_buff *skb, void *hp, daddr, dport, in->ifindex); + if (sk && !atomic_inc_not_zero(&sk->sk_refcnt)) + sk = NULL; /* NOTE: we return listeners even if bound to * 0.0.0.0, those are filtered out in * xt_socket, since xt_TPROXY needs 0 bound @@ -195,6 +197,8 @@ nf_tproxy_get_sock_v6(struct net *net, struct sk_buff *skb, int thoff, void *hp, daddr, ntohs(dport), in->ifindex); + if (sk && !atomic_inc_not_zero(&sk->sk_refcnt)) + sk = NULL; /* NOTE: we return listeners even if bound to * 0.0.0.0, those are filtered out in * xt_socket, since xt_TPROXY needs 0 bound |