linux-kernel - Re: commit 64ff3b938ec6782e6585a83d5459b98b0c3f6eb8 breaks rlogin

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Message-ID: <b6a2187b0902090610v56cc0789m1bbb144994078474@mail.gmail.com>
Date:	Mon, 9 Feb 2009 22:10:32 +0800
From:	Jeff Chua <jeff.chua.linux@...il.com>
To:	Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>
Cc:	Herbert Xu <herbert@...dor.apana.org.au>,
	David Miller <davem@...emloft.net>, rjw@...k.pl,
	torvalds@...ux-foundation.org, LKML <linux-kernel@...r.kernel.org>,
	Netdev <netdev@...r.kernel.org>
Subject: Re: commit 64ff3b938ec6782e6585a83d5459b98b0c3f6eb8 breaks rlogin

On Mon, Feb 9, 2009 at 3:13 PM, Ilpo Järvinen <ilpo.jarvinen@...sinki.fi> wrote:
>  net/ipv4/tcp_output.c |    3 ++-
>  1 files changed, 2 insertions(+), 1 deletions(-)
>
> diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
> index 557fe16..c808d73 100644
> --- a/net/ipv4/tcp_output.c
> +++ b/net/ipv4/tcp_output.c
> @@ -667,7 +667,8 @@ static int tcp_transmit_skb(struct sock *sk, struct sk_buff *skb, int clone_it,
>                if (between(tp->snd_up, tcb->seq + 1, tcb->seq + 0xFFFF)) {
>                        th->urg_ptr = htons(tp->snd_up - tcb->seq);
>                        th->urg = 1;
> -               } else if (after(tcb->seq + 0xFFFF, tp->snd_nxt)) {
> +               } else if (after(tcb->seq + 0xFFFF, tp->snd_nxt) &&
> +                          before(tcb->seq, tcp->snd_up)) {
>                        th->urg_ptr = 0xFFFF;
>                        th->urg = 1;
>                }
> --
> 1.5.6.5
>

Ilpo,

Got this error ...

  CC      net/ipv4/tcp_output.o
net/ipv4/tcp_output.c: In function 'tcp_transmit_skb':
net/ipv4/tcp_output.c:671: error: 'tcp' undeclared (first use in this function)
net/ipv4/tcp_output.c:671: error: (Each undeclared identifier is
reported only once
net/ipv4/tcp_output.c:671: error: for each function it appears in.)

> +                          before(tcb->seq, tcp->snd_up)) {

That should be "tp->snd_up" instead of "tcp->snd_up". Other than that,
the good news is I've tested your patch on top of Herbert's patch, and
it works! No more rlogin hangs!

Thanks,
Jeff.
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