linux-kernel - Re: [PATCH net v2] team: fix null-ptr-deref when team device type is changed

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Message-ID: <ZPbsW/bOGeO9Ww8+@Laptop-X1>
Date:   Tue, 5 Sep 2023 16:52:43 +0800
From:   Hangbin Liu <liuhangbin@...il.com>
To:     Ziyang Xuan <william.xuanziyang@...wei.com>
Cc:     jiri@...nulli.us, 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] team: fix null-ptr-deref when team device type is
 changed

On Tue, Sep 05, 2023 at 03:46:38PM +0800, Ziyang Xuan wrote:
> diff --git a/drivers/net/team/team.c b/drivers/net/team/team.c
> index d3dc22509ea5..12fb5f4cff06 100644
> --- a/drivers/net/team/team.c
> +++ b/drivers/net/team/team.c
> @@ -2127,7 +2127,10 @@ static const struct ethtool_ops team_ethtool_ops = {
>  static void team_setup_by_port(struct net_device *dev,
>  			       struct net_device *port_dev)
>  {
> -	dev->header_ops	= port_dev->header_ops;
> +	if (port_dev->type == ARPHRD_ETHER)
> +		dev->header_ops	= &eth_header_ops;
> +	else
> +		dev->header_ops	= port_dev->header_ops;
>  	dev->type = port_dev->type;
>  	dev->hard_header_len = port_dev->hard_header_len;
>  	dev->needed_headroom = port_dev->needed_headroom;

Hmm.. Do we need to export eth_header_ops? I got error like
ERROR: modpost: "eth_header_ops" [drivers/net/team/team.ko] undefined!

But I saw function loopback_setup() could reference this. Not sure what
I missed here.

Thanks
Hangbin