diff options
| author | Eric Dumazet <eric.dumazet@gmail.com> | 2010-03-08 11:32:01 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-04-01 16:02:11 -0700 |
| commit | e3f1272e2083ee9cf0a21a405ff24b95c2423a97 (patch) | |
| tree | 38d2819c02772c41dd56510ca3b66975bf8e27eb /net | |
| parent | f1783b77374b69b6b91123da581e939caa13b7d1 (diff) | |
tcp: Fix tcp_make_synack()
[ Upstream commit 28b2774a0d5852236dab77a4147b8b88548110f1 ]
Commit 4957faad (TCPCT part 1g: Responder Cookie => Initiator), part
of TCP_COOKIE_TRANSACTION implementation, forgot to correctly size
synack skb in case user data must be included.
Many thanks to Mika Pentillä for spotting this error.
Reported-by: Penttillä Mika <mika.penttila@ixonos.com>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv4/tcp_output.c | 18 |
1 files changed, 9 insertions, 9 deletions
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c index 383ce237640..dc26654cf11 100644 --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -2393,13 +2393,17 @@ struct sk_buff *tcp_make_synack(struct sock *sk, struct dst_entry *dst, struct tcp_extend_values *xvp = tcp_xv(rvp); struct inet_request_sock *ireq = inet_rsk(req); struct tcp_sock *tp = tcp_sk(sk); + const struct tcp_cookie_values *cvp = tp->cookie_values; struct tcphdr *th; struct sk_buff *skb; struct tcp_md5sig_key *md5; int tcp_header_size; int mss; + int s_data_desired = 0; - skb = sock_wmalloc(sk, MAX_TCP_HEADER + 15, 1, GFP_ATOMIC); + if (cvp != NULL && cvp->s_data_constant && cvp->s_data_desired) + s_data_desired = cvp->s_data_desired; + skb = sock_wmalloc(sk, MAX_TCP_HEADER + 15 + s_data_desired, 1, GFP_ATOMIC); if (skb == NULL) return NULL; @@ -2454,16 +2458,12 @@ struct sk_buff *tcp_make_synack(struct sock *sk, struct dst_entry *dst, TCPCB_FLAG_SYN | TCPCB_FLAG_ACK); if (OPTION_COOKIE_EXTENSION & opts.options) { - const struct tcp_cookie_values *cvp = tp->cookie_values; - - if (cvp != NULL && - cvp->s_data_constant && - cvp->s_data_desired > 0) { - u8 *buf = skb_put(skb, cvp->s_data_desired); + if (s_data_desired) { + u8 *buf = skb_put(skb, s_data_desired); /* copy data directly from the listening socket. */ - memcpy(buf, cvp->s_data_payload, cvp->s_data_desired); - TCP_SKB_CB(skb)->end_seq += cvp->s_data_desired; + memcpy(buf, cvp->s_data_payload, s_data_desired); + TCP_SKB_CB(skb)->end_seq += s_data_desired; } if (opts.hash_size > 0) { |