netdev - Re: [PATCH] net-tcp: fix panic in tcp_fastopen_cache

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Date:	Wed, 13 Nov 2013 15:08:11 -0800
From:	Yuchung Cheng <ycheng@...gle.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Dave Jones <davej@...hat.com>, David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH] net-tcp: fix panic in tcp_fastopen_cache_set()

On Wed, Nov 13, 2013 at 3:00 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> From: Eric Dumazet <edumazet@...gle.com>
>
> We had some reports of crashes using TCP fastopen, and Dave Jones
> gave a nice stack trace pointing to the error.
>
> Issue is that tcp_get_metrics() should not be called with a NULL dst
>
> Fixes: 1fe4c481ba637 ("net-tcp: Fast Open client - cookie cache")
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Reported-by: Dave Jones <davej@...hat.com>
> Cc: Yuchung Cheng <ycheng@...gle.com>
Acked-by: Yuchung Cheng <ycheng@...gle.com>

> ---
>  net/ipv4/tcp_metrics.c |    5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/net/ipv4/tcp_metrics.c b/net/ipv4/tcp_metrics.c
> index 2ab09cbae74d..d3ee2e0c28b6 100644
> --- a/net/ipv4/tcp_metrics.c
> +++ b/net/ipv4/tcp_metrics.c
> @@ -663,10 +663,13 @@ void tcp_fastopen_cache_get(struct sock *sk, u16 *mss,
>  void tcp_fastopen_cache_set(struct sock *sk, u16 mss,
>                             struct tcp_fastopen_cookie *cookie, bool syn_lost)
>  {
> +       struct dst_entry *dst = __sk_dst_get(sk);
>         struct tcp_metrics_block *tm;
>
> +       if (!dst)
> +               return;
>         rcu_read_lock();
> -       tm = tcp_get_metrics(sk, __sk_dst_get(sk), true);
> +       tm = tcp_get_metrics(sk, dst, true);
>         if (tm) {
>                 struct tcp_fastopen_metrics *tfom = &tm->tcpm_fastopen;
>
>
>
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