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| author | Gilad Ben-Yossef <gilad@codefidence.com> | 2009-11-04 23:21:44 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-11-04 23:24:14 -0800 |
| commit | 05eaade2782fb0c90d3034fd7a7d5a16266182bb (patch) | |
| tree | 57a7229c25b49ded65319e23ffb300dfb9339cf2 | |
| parent | 8d044fe6aacaf573112331847155211a56a12736 (diff) | |
| download | linux-05eaade2782fb0c90d3034fd7a7d5a16266182bb.tar.gz linux-05eaade2782fb0c90d3034fd7a7d5a16266182bb.tar.bz2 linux-05eaade2782fb0c90d3034fd7a7d5a16266182bb.zip | |
tcp: Do not call IPv4 specific func in tcp_check_req
Calling IPv4 specific inet_csk_route_req in tcp_check_req
is a bad idea and crashes machine on IPv6 connections, as reported
by Valdis Kletnieks
Also, all we are really interested in is the timestamp
option in the header, so calling tcp_parse_options()
with the "estab" set to false flag is an overkill as
it tries to parse half a dozen other TCP options.
We know whether timestamp should be enabled or not
using data from request_sock.
Signed-off-by: Gilad Ben-Yossef <gilad@codefidence.com>
Tested-by: Valdis.Kletnieks@vt.edu
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/ipv4/tcp_minisocks.c | 9 |
1 files changed, 3 insertions, 6 deletions
diff --git a/net/ipv4/tcp_minisocks.c b/net/ipv4/tcp_minisocks.c index 463d51b53d37..a9d34e224cb6 100644 --- a/net/ipv4/tcp_minisocks.c +++ b/net/ipv4/tcp_minisocks.c @@ -500,11 +500,10 @@ struct sock *tcp_check_req(struct sock *sk, struct sk_buff *skb, int paws_reject = 0; struct tcp_options_received tmp_opt; struct sock *child; - struct dst_entry *dst = inet_csk_route_req(sk, req); - tmp_opt.saw_tstamp = 0; - if (th->doff > (sizeof(struct tcphdr)>>2)) { - tcp_parse_options(skb, &tmp_opt, 0, dst); + if ((th->doff > (sizeof(struct tcphdr)>>2)) && (req->ts_recent)) { + tmp_opt.tstamp_ok = 1; + tcp_parse_options(skb, &tmp_opt, 1, NULL); if (tmp_opt.saw_tstamp) { tmp_opt.ts_recent = req->ts_recent; @@ -517,8 +516,6 @@ struct sock *tcp_check_req(struct sock *sk, struct sk_buff *skb, } } - dst_release(dst); - /* Check for pure retransmitted SYN. */ if (TCP_SKB_CB(skb)->seq == tcp_rsk(req)->rcv_isn && flg == TCP_FLAG_SYN && |