From ad5d02a5860a84a56078e1684575b79978c2e6f8 Mon Sep 17 00:00:00 2001 From: JP Abgrall Date: Wed, 20 Feb 2013 16:38:34 -0800 Subject: [PATCH] netfilter: xt_qtaguid: fix bad tcp_time_wait sock handling Since (41063e9 ipv4: Early TCP socket demux), skb's can have an sk which is not a struct sock but the smaller struct inet_timewait_sock without an sk->sk_socket. Now we bypass sk_state == TCP_TIME_WAIT Signed-off-by: JP Abgrall --- net/netfilter/xt_qtaguid.c | 16 +++++++++++----- 1 file changed, 11 insertions(+), 5 deletions(-) diff --git a/net/netfilter/xt_qtaguid.c b/net/netfilter/xt_qtaguid.c index 435664135785..e476b88f9d68 100644 --- a/net/netfilter/xt_qtaguid.c +++ b/net/netfilter/xt_qtaguid.c @@ -1597,14 +1597,13 @@ static struct sock *qtaguid_find_sk(const struct sk_buff *skb, return NULL; } - /* - * Seems to be issues on the file ptr for TCP_TIME_WAIT SKs. - * http://kerneltrap.org/mailarchive/linux-netdev/2010/10/21/6287959 - * Not fixed in 3.0-r3 :( - */ if (sk) { MT_DEBUG("qtaguid: %p->sk_proto=%u " "->sk_state=%d\n", sk, sk->sk_protocol, sk->sk_state); + /* + * When in TCP_TIME_WAIT the sk is not a "struct sock" but + * "struct inet_timewait_sock" which is missing fields. + */ if (sk->sk_state == TCP_TIME_WAIT) { xt_socket_put_sk(sk); sk = NULL; @@ -1688,6 +1687,13 @@ static bool qtaguid_mt(const struct sk_buff *skb, struct xt_action_param *par) } sk = skb->sk; + /* + * When in TCP_TIME_WAIT the sk is not a "struct sock" but + * "struct inet_timewait_sock" which is missing fields. + * So we ignore it. + */ + if (sk && sk->sk_state == TCP_TIME_WAIT) + sk = NULL; if (sk == NULL) { /* * A missing sk->sk_socket happens when packets are in-flight -- 2.20.1