diff options
| author | Eric Dumazet <edumazet@google.com> | 2015-11-05 11:07:13 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-11-05 14:36:09 -0500 |
| commit | 805c4bc05705fb2b71ec970960b456eee9900953 (patch) | |
| tree | 6e753b369a8f3663b5a50d3174b1a6fe0495714f /net/ipv4 | |
| parent | 428ad1bc6dd766bb44171bba43a8a3219be77d2e (diff) | |
| download | linux-805c4bc05705fb2b71ec970960b456eee9900953.tar.gz linux-805c4bc05705fb2b71ec970960b456eee9900953.tar.bz2 linux-805c4bc05705fb2b71ec970960b456eee9900953.zip | |
tcp: fix req->saved_syn race
For the reasons explained in commit ce1050089c96 ("tcp/dccp: fix
ireq->pktopts race"), we need to make sure we do not access
req->saved_syn unless we own the request sock.
This fixes races for listeners using TCP_SAVE_SYN option.
Fixes: e994b2f0fb92 ("tcp: do not lock listener to process SYN packets")
Fixes: 079096f103fa ("tcp/dccp: install syn_recv requests into ehash table")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Ying Cai <ycai@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
| -rw-r--r-- | net/ipv4/tcp_ipv4.c | 2 | ||||
| -rw-r--r-- | net/ipv4/tcp_minisocks.c | 3 |
2 files changed, 2 insertions, 3 deletions
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c index 1c2648bbac4b..59aff63b1776 100644 --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -1326,6 +1326,8 @@ struct sock *tcp_v4_syn_recv_sock(const struct sock *sk, struct sk_buff *skb, if (__inet_inherit_port(sk, newsk) < 0) goto put_and_exit; *own_req = inet_ehash_nolisten(newsk, req_to_sk(req_unhash)); + if (*own_req) + tcp_move_syn(newtp, req_unhash); return newsk; diff --git a/net/ipv4/tcp_minisocks.c b/net/ipv4/tcp_minisocks.c index 3575dd1e5b67..ac6b1961ffeb 100644 --- a/net/ipv4/tcp_minisocks.c +++ b/net/ipv4/tcp_minisocks.c @@ -551,9 +551,6 @@ struct sock *tcp_create_openreq_child(const struct sock *sk, newtp->rack.mstamp.v64 = 0; newtp->rack.advanced = 0; - newtp->saved_syn = req->saved_syn; - req->saved_syn = NULL; - TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_PASSIVEOPENS); } return newsk; |