netdev - Re: [PATCH v2 net-next 2/2] kcm: Check if sk_user_data already set in kcm

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Date:   Wed, 24 Jan 2018 12:52:54 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Tom Herbert <tom@...ntonium.net>, davem@...emloft.net
Cc:     netdev@...r.kernel.org, rohit@...ntonium.net, jchapman@...alix.com,
        g.nault@...halink.fr
Subject: Re: [PATCH v2 net-next 2/2] kcm: Check if sk_user_data already set
 in kcm_attach

On Wed, 2018-01-24 at 12:35 -0800, Tom Herbert wrote:
> This is needed to prevent sk_user_data being overwritten.
> The check is done under the callback lock. This should prevent
> a socket from being attached twice to a KCM mux. It also prevents
> a socket from being attached for other use cases of sk_user_data
> as long as the other cases set sk_user_data under the lock.
> Followup work is needed to unify all the use cases of sk_user_data
> to use the same locking.
> 

Reviewed-by: Eric Dumazet <edumazet@...gle.com>