netdev - Re: [PATCH wpan 2/2] net: mac802154: tx: expand tailroom if necessary

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Date:   Mon, 6 Aug 2018 11:26:51 +0200
From:   Stefan Schmidt <stefan@...enfreihafen.org>
To:     Alexander Aring <aring@...atatu.com>, stefan@....samsung.com
Cc:     linux-wpan@...r.kernel.org, netdev@...r.kernel.org,
        kernel@...atatu.com
Subject: Re: [PATCH wpan 2/2] net: mac802154: tx: expand tailroom if necessary

Hello.

On 07/02/2018 10:32 PM, Alexander Aring wrote:
> This patch is necessary if case of AF_PACKET or other socket interface
> which I am aware of it and didn't allocated the necessary room.
> 
> Reported-by: David Palma <david.palma@...u.no>
> Reported-by: Rabi Narayan Sahoo <rabinarayans0828@...il.com>
> Signed-off-by: Alexander Aring <aring@...atatu.com>
> ---
>  net/mac802154/tx.c | 15 ++++++++++++++-
>  1 file changed, 14 insertions(+), 1 deletion(-)
> 
> diff --git a/net/mac802154/tx.c b/net/mac802154/tx.c
> index 7e253455f9dd..bcd1a5e6ebf4 100644
> --- a/net/mac802154/tx.c
> +++ b/net/mac802154/tx.c
> @@ -63,8 +63,21 @@ ieee802154_tx(struct ieee802154_local *local, struct sk_buff *skb)
>  	int ret;
>  
>  	if (!(local->hw.flags & IEEE802154_HW_TX_OMIT_CKSUM)) {
> -		u16 crc = crc_ccitt(0, skb->data, skb->len);
> +		struct sk_buff *nskb;
> +		u16 crc;
> +
> +		if (unlikely(skb_tailroom(skb) < IEEE802154_FCS_LEN)) {
> +			nskb = skb_copy_expand(skb, 0, IEEE802154_FCS_LEN,
> +					       GFP_ATOMIC);
> +			if (likely(nskb)) {
> +				consume_skb(skb);
> +				skb = nskb;
> +			} else {
> +				goto err_tx;
> +			}
> +		}
>  
> +		crc = crc_ccitt(0, skb->data, skb->len);
>  		put_unaligned_le16(crc, skb_put(skb, 2));
>  	}
>  
> 

This patch has been applied to the wpan-next tree and will be
part of the next pull request to net-next. Thanks!

I know you submitted this for wpan instead of wpan-next, but with rc8
being out I will not submit another pull request for 4.18. Instead I
added cc stable to the patch to make sure it gets picked into the stable
tree once 4.18 is out.

regards
Stefan Schmidt