linux-kernel - Re: [PATCH tip/core/rcu 4/4] netfilter: Fix list_entry

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Date:	Tue, 12 May 2015 22:42:46 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...nel.org,
	laijs@...fujitsu.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
	josh@...htriplett.org, tglx@...utronix.de, peterz@...radead.org,
	dhowells@...hat.com, edumazet@...gle.com, dvhart@...ux.intel.com,
	fweisbec@...il.com, oleg@...hat.com, bobby.prani@...il.com,
	patrick.marlier@...il.com, davem@...emloft.net
Subject: Re: [PATCH tip/core/rcu 4/4] netfilter: Fix list_entry_rcu usage

On Tue, 12 May 2015 15:46:27 -0700
"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> wrote:

> From: Patrick Marlier <patrick.marlier@...il.com>
> 
> Signed-off-by: Patrick Marlier <patrick.marlier@...il.com>
> Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> ---
>  net/netfilter/core.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/netfilter/core.c b/net/netfilter/core.c
> index e6163017c42d..ad70195929a4 100644
> --- a/net/netfilter/core.c
> +++ b/net/netfilter/core.c
> @@ -166,7 +166,7 @@ int nf_hook_slow(struct sk_buff *skb, struct nf_hook_state *state)
>  	/* We may already have this, but read-locks nest anyway */
>  	rcu_read_lock();
>  
> -	elem = list_entry_rcu(&nf_hooks[state->pf][state->hook],
> +	elem = list_entry_rcu(nf_hooks[state->pf][state->hook].next,
>  			      struct nf_hook_ops, list);

Looks to be setting to the next element, not the current one.

-- Steve



>  next_hook:
>  	verdict = nf_iterate(&nf_hooks[state->pf][state->hook], skb, state,

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