linux-kernel - Re: [PATCH net] nfc: nci: Fix handling of zero-length payload packets in nci_rx

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Message-ID: <20240516084348.GF179178@kernel.org>
Date: Thu, 16 May 2024 09:43:48 +0100
From: Simon Horman <horms@...nel.org>
To: Ryosuke Yasuoka <ryasuoka@...hat.com>
Cc: krzk@...nel.org, davem@...emloft.net, edumazet@...gle.com,
	kuba@...nel.org, pabeni@...hat.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, syoshida@...hat.com
Subject: Re: [PATCH net] nfc: nci: Fix handling of zero-length payload
 packets in nci_rx_work()

Hi Yasuoka-san,

On Thu, May 16, 2024 at 12:17:07AM +0900, Ryosuke Yasuoka wrote:
> When nci_rx_work() receives a zero-length payload packet, it should
> discard the packet without exiting the loop. Instead, it should continue
> processing subsequent packets.

nit: I think it would be clearer to say:

.. it should not discard the packet and exit the loop. Instead, ...

> 
> Fixes: d24b03535e5e ("nfc: nci: Fix uninit-value in nci_dev_up and nci_ntf_packet")
> Closes: https://lore.kernel.org/lkml/20240428134525.GW516117@kernel.org/T/

nit: I'm not sure this Closes link is adding much,
     there are more changes coming, right?

> Reported-by: Ryosuke Yasuoka <ryasuoka@...hat.com>
> Signed-off-by: Ryosuke Yasuoka <ryasuoka@...hat.com>
> ---
>  net/nfc/nci/core.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/net/nfc/nci/core.c b/net/nfc/nci/core.c
> index b133dc55304c..f2ae8b0d81b9 100644
> --- a/net/nfc/nci/core.c
> +++ b/net/nfc/nci/core.c
> @@ -1518,8 +1518,7 @@ static void nci_rx_work(struct work_struct *work)
>  
>  		if (!nci_plen(skb->data)) {
>  			kfree_skb(skb);
> -			kcov_remote_stop();
> -			break;
> +			continue;
>  		}
>  
>  		/* Process frame */
> -- 
> 2.44.0
> 
>