linux-kernel - Re: [PATCH net 1/2] net: bridge: fix multicast-to-unicast with fraglist GSO

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Date: Tue, 30 Apr 2024 13:07:21 +0200
From: Paolo Abeni <pabeni@...hat.com>
To: Felix Fietkau <nbd@....name>, netdev@...r.kernel.org, Roopa Prabhu
 <roopa@...dia.com>, Nikolay Aleksandrov <razor@...ckwall.org>, "David S.
 Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub
 Kicinski <kuba@...nel.org>,  Linus Lüssing
 <linus.luessing@...3.blue>
Cc: bridge@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net 1/2] net: bridge: fix multicast-to-unicast with
 fraglist GSO

On Sat, 2024-04-27 at 20:24 +0200, Felix Fietkau wrote:
> Calling skb_copy on a SKB_GSO_FRAGLIST skb is not valid, since it returns
> an invalid linearized skb. This code only needs to change the ethernet
> header, so pskb_copy is the right function to call here.
> 
> Fixes: 6db6f0eae605 ("bridge: multicast to unicast")
> Signed-off-by: Felix Fietkau <nbd@....name>
> ---
>  net/bridge/br_forward.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/bridge/br_forward.c b/net/bridge/br_forward.c
> index 7431f89e897b..d7c35f55bd69 100644
> --- a/net/bridge/br_forward.c
> +++ b/net/bridge/br_forward.c
> @@ -266,7 +266,7 @@ static void maybe_deliver_addr(struct net_bridge_port *p, struct sk_buff *skb,
>  	if (skb->dev == p->dev && ether_addr_equal(src, addr))
>  		return;
>  
> -	skb = skb_copy(skb, GFP_ATOMIC);
> +	skb = pskb_copy(skb, GFP_ATOMIC);
>  	if (!skb) {
>  		DEV_STATS_INC(dev, tx_dropped);
>  		return;

LGTM, but let's wait a little more time for Nikolay

Acked-by: Paolo Abeni <pabeni@...hat.com>