netdev - Re: [PATCH net-next 07/13] net: ipv4: ipmr: perform strict checks also for doit handlers

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Message-ID: <744e56db-c28d-2207-f5c1-8ba15a7aa95e@gmail.com>
Date:   Fri, 18 Jan 2019 07:24:59 -0700
From:   David Ahern <dsahern@...il.com>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>, davem@...emloft.net
Cc:     netdev@...r.kernel.org, oss-drivers@...ronome.com
Subject: Re: [PATCH net-next 07/13] net: ipv4: ipmr: perform strict checks
 also for doit handlers

On 1/17/19 3:52 PM, Jakub Kicinski wrote:
> +	rtm = nlmsg_data(nlh);
> +	if ((rtm->rtm_src_len && rtm->rtm_src_len != 32) ||
> +	    (rtm->rtm_dst_len && rtm->rtm_dst_len != 32) ||
> +	    rtm->rtm_tos || rtm->rtm_table || rtm->rtm_protocol ||
> +	    rtm->rtm_scope || rtm->rtm_type || rtm->rtm_flags) {
> +		NL_SET_ERR_MSG(extack, "ipv4: MR invalid values in header for route get request");

The MR at the beginning makes that read awkwardly. Perhaps:

ipv4: Invalid values in header for multicast route get request


> +		return -EINVAL;
> +	}
> +
> +	err = nlmsg_parse_strict(nlh, sizeof(*rtm), tb, RTA_MAX,
> +				 rtm_ipv4_policy, extack);
> +	if (err)
> +		return err;
> +
> +	if ((tb[RTA_SRC] && !rtm->rtm_src_len) ||
> +	    (tb[RTA_DST] && !rtm->rtm_dst_len)) {
> +		NL_SET_ERR_MSG(extack, "ipv4: MR rtm_src_len and rtm_dst_len must be 32 for IPv4");

and here. Also ipv4 is listed twice.

> +		return -EINVAL;
> +	}
> +
> +	for (i = 0; i <= RTA_MAX; i++) {
> +		if (!tb[i])
> +			continue;
> +
> +		switch (i) {
> +		case RTA_SRC:
> +		case RTA_DST:
> +		case RTA_TABLE:
> +			break;
> +		default:
> +			NL_SET_ERR_MSG(extack, "ipv4: MR unsupported attribute in route get request");

and here