netdev - Re: [RFC v2 1/2] netlink: add NLA

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Date:   Wed, 12 Sep 2018 10:38:12 +0200
From:   Johannes Berg <johannes@...solutions.net>
To:     linux-wireless@...r.kernel.org, netdev@...r.kernel.org
Cc:     Michal Kubecek <mkubecek@...e.cz>
Subject: Re: [RFC v2 1/2] netlink: add NLA_REJECT policy type

On Wed, 2018-09-12 at 10:36 +0200, Johannes Berg wrote:
> @@ -251,7 +257,7 @@ int nla_parse(struct nlattr **tb, int maxtype, const struct nlattr *head,
>  
>  		if (type > 0 && type <= maxtype) {
>  			if (policy) {
> -				err = validate_nla(nla, maxtype, policy);
> +				err = validate_nla(nla, maxtype, policy, extack);
>  				if (err < 0) {
>  					NL_SET_ERR_MSG_ATTR(extack, nla,
>  							    "Attribute failed policy validation");

Err... I should read my patches before sending them :-)

Clearly, this NL_SET_ERR_MSG_ATTR() overwrites the error message, so
would have to be made conditional.

I can fix that (and I should use/test it) if we decide it's worthwhile.

johannes