netdev - Re: [PATCH 1/2] sctp: proc: protect bind_addr->address_list accesses with rcu_read

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Message-ID: <50C0FAF8.6060706@gmail.com>
Date:	Thu, 06 Dec 2012 15:07:20 -0500
From:	Vlad Yasevich <vyasevich@...il.com>
To:	Thomas Graf <tgraf@...g.ch>
CC:	linux-sctp@...r.kernel.org, netdev@...r.kernel.org,
	nhorman@...driver.com, Thomas Graf <tgraf@...hat.com>
Subject: Re: [PATCH 1/2] sctp: proc: protect bind_addr->address_list accesses
 with rcu_read_lock()

On 12/06/2012 02:25 PM, Thomas Graf wrote:
> From: Thomas Graf <tgraf@...hat.com>
>
> address_list is protected via the socket lock or RCU. Since we don't want
> to take the socket lock for each assoc we dump in procfs a RCU read-side
> critical section must be entered.
>
> V2: Skip local addresses marked as dead
>
> Cc: Vlad Yasevich <vyasevich@...il.com>
> Cc: Neil Horman <nhorman@...driver.com>
> Signed-off-by: Thomas Graf <tgraf@...g.ch>

Acked-by: Vlad Yasevich <vyasevic@...il.com>

-vlad

> ---
>   net/sctp/proc.c | 7 ++++++-
>   1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/net/sctp/proc.c b/net/sctp/proc.c
> index 9966e7b..06b05ee 100644
> --- a/net/sctp/proc.c
> +++ b/net/sctp/proc.c
> @@ -139,7 +139,11 @@ static void sctp_seq_dump_local_addrs(struct seq_file *seq, struct sctp_ep_commo
>   	    primary = &peer->saddr;
>   	}
>
> -	list_for_each_entry(laddr, &epb->bind_addr.address_list, list) {
> +	rcu_read_lock();
> +	list_for_each_entry_rcu(laddr, &epb->bind_addr.address_list, list) {
> +		if (!laddr->valid)
> +			continue;
> +
>   		addr = &laddr->a;
>   		af = sctp_get_af_specific(addr->sa.sa_family);
>   		if (primary && af->cmp_addr(addr, primary)) {
> @@ -147,6 +151,7 @@ static void sctp_seq_dump_local_addrs(struct seq_file *seq, struct sctp_ep_commo
>   		}
>   		af->seq_dump_addr(seq, addr);
>   	}
> +	rcu_read_unlock();
>   }
>
>   /* Dump remote addresses of an association. */
>

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