netdev - Re: [PATCH RFC v2 30/33] xdp: clear grow memory in bpf_xdp_adjust

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Message-Id: <20200408.144914.956216445223066424.davem@davemloft.net>
Date:   Wed, 08 Apr 2020 14:49:14 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     brouer@...hat.com
Cc:     sameehj@...zon.com, netdev@...r.kernel.org, bpf@...r.kernel.org,
        zorik@...zon.com, akiyano@...zon.com, gtzalik@...zon.com,
        toke@...hat.com, borkmann@...earbox.net,
        alexei.starovoitov@...il.com, john.fastabend@...il.com,
        alexander.duyck@...il.com, jeffrey.t.kirsher@...el.com,
        dsahern@...il.com, willemdebruijn.kernel@...il.com,
        ilias.apalodimas@...aro.org, lorenzo@...nel.org,
        saeedm@...lanox.com
Subject: Re: [PATCH RFC v2 30/33] xdp: clear grow memory in
 bpf_xdp_adjust_tail()

From: Jesper Dangaard Brouer <brouer@...hat.com>
Date: Wed, 08 Apr 2020 13:53:06 +0200

> @@ -3445,6 +3445,11 @@ BPF_CALL_2(bpf_xdp_adjust_tail, struct xdp_buff *, xdp, int, offset)
>  	if (unlikely(data_end < xdp->data + ETH_HLEN))
>  		return -EINVAL;
>  
> +	/* Clear memory area on grow, can contain uninit kernel memory */
> +	if (offset > 0) {
> +		memset(xdp->data_end, 0, offset);
> +	}

Single statement basic blocks should elide curly braces.