netdev - Re: [PATCH net-next v5] mctp: Implement extended addressing

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Message-Id: <20211025.161549.899716517054473254.davem@davemloft.net>
Date:   Mon, 25 Oct 2021 16:15:49 +0100 (BST)
From:   David Miller <davem@...emloft.net>
To:     jk@...econstruct.com.au
Cc:     netdev@...r.kernel.org, kuba@...nel.org, matt@...econstruct.com.au,
        esyr@...hat.com
Subject: Re: [PATCH net-next v5] mctp: Implement extended addressing

From: Jeremy Kerr <jk@...econstruct.com.au>
Date: Mon, 25 Oct 2021 11:27:57 +0800

> @@ -152,10 +155,16 @@ struct mctp_sk_key {
>  
>  struct mctp_skb_cb {
>  	unsigned int	magic;
> -	unsigned int	net;
> +	int		net;
> +	int		ifindex; /* extended/direct addressing if set */
> +	unsigned char	halen;
>  	mctp_eid_t	src;
> +	unsigned char	haddr[];
>  };
>  
putting a variably sized type in the skb control blocxk is not a good idea.
Overruns will be silent, nothing in the typing protects you from udsing more space
han exists in skb->cb.

Plrease find another way, thank you.