netdev - Re: [PATCH 1/5] net_sched: Fail if missing mandatory action operation methods

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Date:	Wed, 04 Dec 2013 09:03:50 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jamal Hadi Salim <jhs@...atatu.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org,
	alexander.h.duyck@...el.com, ebiederm@...ssion.com
Subject: Re: [PATCH 1/5] net_sched: Fail if missing mandatory action
 operation methods

On Wed, 2013-12-04 at 09:26 -0500, Jamal Hadi Salim wrote:
> Signed-off-by: Jamal Hadi Salim <jhs@...atatu.com>
> ---
>  net/sched/act_api.c |   12 ++++++++----
>  1 file changed, 8 insertions(+), 4 deletions(-)
> 
> diff --git a/net/sched/act_api.c b/net/sched/act_api.c
> index fd70728..618695e 100644
> --- a/net/sched/act_api.c
> +++ b/net/sched/act_api.c
> @@ -270,6 +270,10 @@ int tcf_register_action(struct tc_action_ops *act)
>  {
>  	struct tc_action_ops *a, **ap;
>  
> +	/* Must supply act, dump, cleanup and init */
> +	if (!act->act || !act->dump || !act->cleanup || !act->init)
> +		return -EINVAL;
> +
>  	write_lock(&act_mod_lock);
>  	for (ap = &act_base; (a = *ap) != NULL; ap = &a->next) {
>  		if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) {
> @@ -381,7 +385,7 @@ int tcf_action_exec(struct sk_buff *skb, const struct tc_action *act,
>  	}
>  	while ((a = act) != NULL) {
>  repeat:
> -		if (a->ops && a->ops->act) {
> +		if (a->ops) {

Could we remove all these tests on a->ops being NULL or not ?

IMHO a->ops cannot be NULL. If NULL, just crash by NULL deref.




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