linux-kernel - Re: [PATCH net] net: systemport: fix potential memory leak in bcm_sysport

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Message-ID: <20241015110154.55c7442f@kernel.org>
Date: Tue, 15 Oct 2024 11:01:54 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Florian Fainelli <florian.fainelli@...adcom.com>
Cc: Wang Hai <wanghai38@...wei.com>, bcm-kernel-feedback-list@...adcom.com,
 davem@...emloft.net, edumazet@...gle.com, pabeni@...hat.com,
 zhangxiaoxu5@...wei.com, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] net: systemport: fix potential memory leak in
 bcm_sysport_xmit()

On Mon, 14 Oct 2024 09:59:27 -0700 Florian Fainelli wrote:
> > diff --git a/drivers/net/ethernet/broadcom/bcmsysport.c b/drivers/net/ethernet/broadcom/bcmsysport.c
> > index c9faa8540859..0a68b526e4a8 100644
> > --- a/drivers/net/ethernet/broadcom/bcmsysport.c
> > +++ b/drivers/net/ethernet/broadcom/bcmsysport.c
> > @@ -1359,6 +1359,7 @@ static netdev_tx_t bcm_sysport_xmit(struct sk_buff *skb,
> >   		netif_err(priv, tx_err, dev, "DMA map failed at %p (len=%d)\n",
> >   			  skb->data, skb_len);
> >   		ret = NETDEV_TX_OK;
> > +		dev_kfree_skb_any(skb);  
> 
> Since we already have a private counter tracking DMA mapping errors, I 
> would follow what the driver does elsewhere in the transmit path, 
> especially what bcm_sysport_insert_tsb() does, and just use 
> dev_consume_skb_any() here.

Are you saying that if the packet drop is accounted is some statistics
we should not inform drop monitor about it? 🤔️ 
That wasn't my understanding of kfree_skb vs consume_skb..