netdev - Re: [PATCH iproute2-next v2 2/2] f_flower: Implement gtp options support

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Message-ID: <20220204102058.7f237f80@hermes.local>
Date:   Fri, 4 Feb 2022 10:20:58 -0800
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Wojciech Drewek <wojciech.drewek@...el.com>
Cc:     netdev@...r.kernel.org, dsahern@...il.com,
        michal.swiatkowski@...ux.intel.com, marcin.szycik@...ux.intel.com
Subject: Re: [PATCH iproute2-next v2 2/2] f_flower: Implement gtp options
 support

On Fri,  4 Feb 2022 17:58:21 +0100
Wojciech Drewek <wojciech.drewek@...el.com> wrote:

> +static void flower_print_gtp_opts(const char *name, struct rtattr *attr,
> +				  char *strbuf)
> +{
> +	struct rtattr *tb[TCA_FLOWER_KEY_ENC_OPT_GTP_MAX + 1];
> +	__u8 pdu_type, qfi;
> +
> +	parse_rtattr(tb, TCA_FLOWER_KEY_ENC_OPT_GTP_MAX, RTA_DATA(attr),
> +		     RTA_PAYLOAD(attr));
> +
> +	pdu_type = rta_getattr_u8(tb[TCA_FLOWER_KEY_ENC_OPT_GTP_PDU_TYPE]);
> +	qfi = rta_getattr_u8(tb[TCA_FLOWER_KEY_ENC_OPT_GTP_QFI]);
> +
> +	sprintf(strbuf, "%02x:%02x", pdu_type, qfi);
> +}

Better to use snprintf and pass length parameter.
You are ok now, but someday this might grow.