linux-kernel - RE: [PATCH v2 net 9/9] net: enetc: fix the off-by-one issue in enetc_map_tx_tso

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Message-ID:
 <AS8PR04MB8849C3544A63C75E37D2079896C52@AS8PR04MB8849.eurprd04.prod.outlook.com>
Date: Wed, 19 Feb 2025 17:46:39 +0000
From: Claudiu Manoil <claudiu.manoil@....com>
To: Wei Fang <wei.fang@....com>, Vladimir Oltean <vladimir.oltean@....com>,
	Clark Wang <xiaoning.wang@....com>, "andrew+netdev@...n.ch"
	<andrew+netdev@...n.ch>, "davem@...emloft.net" <davem@...emloft.net>,
	"edumazet@...gle.com" <edumazet@...gle.com>, "kuba@...nel.org"
	<kuba@...nel.org>, "pabeni@...hat.com" <pabeni@...hat.com>
CC: Ioana Ciornei <ioana.ciornei@....com>, "Y.B. Lu" <yangbo.lu@....com>,
	"michal.swiatkowski@...ux.intel.com" <michal.swiatkowski@...ux.intel.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"imx@...ts.linux.dev" <imx@...ts.linux.dev>, "stable@...r.kernel.org"
	<stable@...r.kernel.org>
Subject: RE: [PATCH v2 net 9/9] net: enetc: fix the off-by-one issue in
 enetc_map_tx_tso_buffs()

> -----Original Message-----
> From: Wei Fang <wei.fang@....com>
> Sent: Wednesday, February 19, 2025 7:43 AM
[...]
> Subject: [PATCH v2 net 9/9] net: enetc: fix the off-by-one issue in
> enetc_map_tx_tso_buffs()
> 
> There is an off-by-one issue for the err_chained_bd path, it will free
> one more tx_swbd than expected. But there is no such issue for the
> err_map_data path. To fix this off-by-one issue and make the two error
> handling consistent, the loop condition of error handling is modified
> and the 'count++' operation is moved before enetc_map_tx_tso_data().
> 
> Fixes: fb8629e2cbfc ("net: enetc: add support for software TSO")
> Cc: stable@...r.kernel.org
> Signed-off-by: Wei Fang <wei.fang@....com>
> ---
>  drivers/net/ethernet/freescale/enetc/enetc.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/ethernet/freescale/enetc/enetc.c
> b/drivers/net/ethernet/freescale/enetc/enetc.c
> index 9a24d1176479..fe3967268a19 100644
> --- a/drivers/net/ethernet/freescale/enetc/enetc.c
> +++ b/drivers/net/ethernet/freescale/enetc/enetc.c
> @@ -832,6 +832,7 @@ static int enetc_map_tx_tso_buffs(struct enetc_bdr
> *tx_ring, struct sk_buff *skb
>  			txbd = ENETC_TXBD(*tx_ring, i);
>  			tx_swbd = &tx_ring->tx_swbd[i];
>  			prefetchw(txbd);
> +			count++;
> 
>  			/* Compute the checksum over this segment of data and
>  			 * add it to the csum already computed (over the L4
> @@ -848,7 +849,6 @@ static int enetc_map_tx_tso_buffs(struct enetc_bdr
> *tx_ring, struct sk_buff *skb
>  				goto err_map_data;
> 
>  			data_len -= size;
> -			count++;

Hi Wei,

My issue is that:
enetc_map_tx_tso_hdr() not only updates the current tx_swbd (so 1 count++
needed), but in case of extension flag it advances 'tx_swbd' and 'i' with another
position so and extra 'count++' would be needed in that case.

Thanks,
-Claudiu