netdev - Re: [PATCH net] genetlink: fix genlmsg

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Date:   Wed, 15 Nov 2017 13:20:10 +0100
From:   Johannes Berg <johannes@...solutions.net>
To:     Michal Kubecek <mkubecek@...e.cz>,
        "David S. Miller" <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] genetlink: fix genlmsg_nlhdr()

On Wed, 2017-11-15 at 13:09 +0100, Michal Kubecek wrote:
> According to the description, first argument of genlmsg_nlhdr() points to
> what genlmsg_put() returns, i.e. beginning of user header. Therefore we
> should only subtract size of genetlink header and netlink message header,
> not user header.
> 
> This also means we don't need to pass the pointer to genetlink family and
> the same is true for genl_dump_check_consistent() which is the only caller
> of genlmsg_nlhdr(). (Note that at the moment, these functions are only
> used for families which do not have user header so that they are not
> affected.)
> 
> Fixes: 670dc2833d14 ("netlink: advertise incomplete dumps")
> Signed-off-by: Michal Kubecek <mkubecek@...e.cz>

Looks sensible, though I don't think it's really needed in net since it
really has no effect - as you note, family->hdrsize is 0 for all the
families calling this right now.

Reviewed-by: Johannes Berg <johannes@...solutions.net>

johannes