linux-kernel - Re: [PATCH v1] net/ethtool/tunnels: check the return value of nla_nest

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Message-ID: <20220920113744.64b16924@kernel.org>
Date:   Tue, 20 Sep 2022 11:37:44 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Li Zhong <floridsleeves@...il.com>
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        pabeni@...hat.com, edumazet@...gle.com, davem@...emloft.net
Subject: Re: [PATCH v1] net/ethtool/tunnels: check the return value of
 nla_nest_start()

On Fri, 16 Sep 2022 19:26:02 -0700 Li Zhong wrote:
>  			goto err_cancel_table;
>  
>  		entry = nla_nest_start(skb, ETHTOOL_A_TUNNEL_UDP_TABLE_ENTRY);
> +		if (!entry)
> +			return -EMSGSIZE;

not even correct, and completely harmless