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authorEric Dumazet <edumazet@google.com>2015-11-05 11:07:13 -0800
committerDavid S. Miller <davem@davemloft.net>2015-11-05 14:36:09 -0500
commit805c4bc05705fb2b71ec970960b456eee9900953 (patch)
tree6e753b369a8f3663b5a50d3174b1a6fe0495714f /net/ipv4
parent428ad1bc6dd766bb44171bba43a8a3219be77d2e (diff)
downloadop-kernel-dev-805c4bc05705fb2b71ec970960b456eee9900953.zip
op-kernel-dev-805c4bc05705fb2b71ec970960b456eee9900953.tar.gz
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.c2
-rw-r--r--net/ipv4/tcp_minisocks.c3
2 files changed, 2 insertions, 3 deletions
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 1c2648b..59aff63 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 3575dd1..ac6b196 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;
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