linux-kernel - Re: [PATCH net v2] net: mscc: ocelot: Fix crash when adding interface under a lag

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Message-ID: <df7cc79c-0f46-4346-a016-1b208346bdf5@wanadoo.fr>
Date: Sat, 20 Dec 2025 21:00:42 +0100
From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
To: Jerry Wu <w.7erry@...mail.com>, vladimir.oltean@....com
Cc: claudiu.manoil@....com, alexandre.belloni@...tlin.com,
 UNGLinuxDriver@...rochip.com, andrew+netdev@...n.ch, davem@...emloft.net,
 edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net v2] net: mscc: ocelot: Fix crash when adding interface
 under a lag

Le 20/12/2025 à 20:01, Jerry Wu a écrit :
> Commit 15faa1f67ab4 ("lan966x: Fix crash when adding interface under a lag")
> fixed a similar issue in the lan966x driver caused by a NULL pointer dereference.
> The ocelot_set_aggr_pgids() function in the ocelot driver has similar logic
> and is susceptible to the same crash.
> 
> This issue specifically affects the ocelot_vsc7514.c frontend, which leaves
> unused ports as NULL pointers. The felix_vsc9959.c frontend is unaffected as
> it uses the DSA framework which registers all ports.
> 
> Fix this by checking if the port pointer is valid before accessing it.
> 
> Fixes: 528d3f190c98 ("net: mscc: ocelot: drop the use of the "lags" array")
> Signed-off-by: Jerry Wu <w.7erry@...mail.com>
> ---
>   drivers/net/ethernet/mscc/ocelot.c | 6 ++++--
>   1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/mscc/ocelot.c b/drivers/net/ethernet/mscc/ocelot.c
> index 08bee56aea35..6f917fd7af4d 100644
> --- a/drivers/net/ethernet/mscc/ocelot.c
> +++ b/drivers/net/ethernet/mscc/ocelot.c
> @@ -2307,14 +2307,16 @@ static void ocelot_set_aggr_pgids(struct ocelot *ocelot)
>   
>   	/* Now, set PGIDs for each active LAG */
>   	for (lag = 0; lag < ocelot->num_phys_ports; lag++) {
> -		struct net_device *bond = ocelot->ports[lag]->bond;
> +		struct ocelot_port *ocelot_port = ocelot->ports[lag];
>   		int num_active_ports = 0;
> +		struct net_device *bond;
>   		unsigned long bond_mask;
>   		u8 aggr_idx[16];
>   
> -		if (!bond || (visited & BIT(lag)))
> +		if (!ocelot_port || !ocelot_port->bond || (visited & BIT(lag)))

ok, but it would be clearer if this was a v3 of the patch.

It is also usually welcomed to explain what has changed between versions 
below the ---.

CJ

>   			continue;
>   
> +		bond = ocelot_port->bond;
>   		bond_mask = ocelot_get_bond_mask(ocelot, bond);
>   
>   		for_each_set_bit(port, &bond_mask, ocelot->num_phys_ports) {