netdev - Re: [PATCH net v2] vxlan: Use RCU apis to access sk_user

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Message-ID: <1380039366.3165.92.camel@edumazet-glaptop>
Date:	Tue, 24 Sep 2013 09:16:06 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Pravin B Shelar <pshelar@...ira.com>
Cc:	netdev@...r.kernel.org, Jesse Gross <jesse@...ira.com>
Subject: Re: [PATCH net v2] vxlan: Use RCU apis to access sk_user_data.

On Tue, 2013-09-24 at 09:09 -0700, Pravin B Shelar wrote:
> Use of RCU api makes vxlan code easier to understand.  It also
> fixes bug due to missing ACCESS_ONCE() on sk_user_data dereference.
> In rare case without ACCESS_ONCE() compiler might omit vs on
> sk_user_data dereference. Compiler can use vs as alias for
> sk->sk_user_data, resulting in multiple sk_user_data dereference
> in rcu read context which could change.
> 
> CC: Jesse Gross <jesse@...ira.com>
> Signed-off-by: Pravin B Shelar <pshelar@...ira.com>
> ---
> v2:
> Use RCU_INIT_POINTER
> ---
>  drivers/net/vxlan.c |   11 ++++-------
>  include/net/sock.h  |    2 ++
>  2 files changed, 6 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
> index d1292fe..1fae0d6 100644
> --- a/drivers/net/vxlan.c
> +++ b/drivers/net/vxlan.c
> @@ -1,4 +1,4 @@
> -/*
> + /*
>   * VXLAN: Virtual eXtensible Local Area Network
>   *


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