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

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Date: Thu, 16 May 2024 18:24:54 +0900
From: Ryosuke Yasuoka <ryasuoka@...hat.com>
To: Simon Horman <horms@...nel.org>
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()

Thank you for your review and comment, Simon.

On Thu, May 16, 2024 at 09:43:48AM +0100, Simon Horman wrote:
> 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, ...

Great. I'll update commit msg like this.

> > 
> > 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?

No. I just wanna show the URL link as a reference where this bug is
found. This URL discuss a little bit different topic as you know.

In the following discussion [1], Jakub pointed out that changing
continue statement to break is not related to the patch "Fix
uninit-value in nci_rw_work". So I posted this new small patch before
posting v5 patch for "Fix: uninit-value in nci_rw_work".

If Closes tag is not appropriate, I can remove this in this v2 patch.
What do you think?

[1] https://lore.kernel.org/all/20240510190613.72838bf0@kernel.org/

> > 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
> > 
> > 
> 

Thank you for your help.
Ryosuke