Hello Rostislav,
looks really good now.
1. Your Signed-off-by: is missing.
2. One remark to a removed length check:
(..)
> +static int em_canid_change(struct tcf_proto *tp, void *data, int len,
> + struct tcf_ematch *m)
> +{
> + struct can_filter *conf = data; /* Array with rules,
> + * fixed size EM_CAN_RULES_SIZE
> + */
> + struct canid_match *cm;
> + struct canid_match *cm_old = (struct canid_match *) m->data;
> + int i;
> + int rulescnt;
> +
What about a zero length check here?
if (!len)
return -EINVAL;
???
> + if (len % sizeof(struct can_filter))
> + return -EINVAL;
> +
> + if (len > sizeof(struct can_filter) * EM_CAN_RULES_MAX)
> + return -EINVAL;
> +
> + rulescnt = len / sizeof(struct can_filter);
> +
> + cm = kzalloc(sizeof(struct canid_match) + sizeof(struct can_filter) *
> + rulescnt, GFP_KERNEL);
> + if (!cm)
> + return -ENOMEM;
The length could alternatively be checked here too
http://lxr.linux.no/#linux+v3.4.4/net/sched/ematch.c#L235
if em->ops->datalen is set.
But here's no
.datalen = sizeof(struct can_filter),
defined, right?
> +static struct tcf_ematch_ops em_canid_ops = {
> + .kind = TCF_EM_CANID,
> + .change = em_canid_change,
> + .match = em_canid_match,
> + .destroy = em_canid_destroy,
> + .dump = em_canid_dump,
> + .owner = THIS_MODULE,
> + .link = LIST_HEAD_INIT(em_canid_ops.link)
> +};
Regards,
Oliver
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