linux-kernel - Re: [PATCH] ieee802154: mcr20a: simplify a bit 'mcr20a_handle_rx_read_buf

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Date:   Wed, 25 Sep 2019 08:25:35 +0200
From:   Stefan Schmidt <stefan@...enfreihafen.org>
To:     Xue Liu <liuxuenetmail@...il.com>
Cc:     Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        "alex. aring" <alex.aring@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        linux-wpan - ML <linux-wpan@...r.kernel.org>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] ieee802154: mcr20a: simplify a bit
 'mcr20a_handle_rx_read_buf_complete()'

Hello.

On 24.09.19 23:40, Xue Liu wrote:
> On Sat, 21 Sep 2019 at 13:52, Stefan Schmidt <stefan@...enfreihafen.org> wrote:
>>
>> Hello Xue.
>>
>> On 20.09.19 21:45, Christophe JAILLET wrote:
>>> Use a 'skb_put_data()' variant instead of rewritting it.
>>> The __skb_put_data variant is safe here. It is obvious that the skb can
>>> not overflow. It has just been allocated a few lines above with the same
>>> 'len'.
>>>
>>> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
>>> ---
>>>   drivers/net/ieee802154/mcr20a.c | 2 +-
>>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/net/ieee802154/mcr20a.c b/drivers/net/ieee802154/mcr20a.c
>>> index 17f2300e63ee..8dc04e2590b1 100644
>>> --- a/drivers/net/ieee802154/mcr20a.c
>>> +++ b/drivers/net/ieee802154/mcr20a.c
>>> @@ -800,7 +800,7 @@ mcr20a_handle_rx_read_buf_complete(void *context)
>>>        if (!skb)
>>>                return;
>>>
>>> -     memcpy(skb_put(skb, len), lp->rx_buf, len);
>>> +     __skb_put_data(skb, lp->rx_buf, len);
>>>        ieee802154_rx_irqsafe(lp->hw, skb, lp->rx_lqi[0]);
>>>
>>>        print_hex_dump_debug("mcr20a rx: ", DUMP_PREFIX_OFFSET, 16, 1,
>>>
>>
>> Could you please review and ACK this? If you are happy I will take it
>> through my tree.
>>
>> regards
>> Stefan Schmidt
> 
> Acked-by: Xue Liu <liuxuenetmail@...il.com>


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

regards
Stefan Schmidt