linux-kernel - Re: [PATCH v3 1/6] udp: allow header check for dodgy GSO_UDP

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Message-ID: <f59a8400-54ba-62eb-2e9b-b8a6b7533f90@kernel.org>
Date:   Wed, 7 Sep 2022 18:40:56 -0600
From:   David Ahern <dsahern@...nel.org>
To:     Andrew Melnychenko <andrew@...nix.com>, edumazet@...gle.com,
        netdev@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, davem@...emloft.net, kuba@...nel.org,
        jasowang@...hat.com, mst@...hat.com, pabeni@...hat.com,
        yoshfuji@...ux-ipv6.org
Cc:     yan@...nix.com, yuri.benditovich@...nix.com
Subject: Re: [PATCH v3 1/6] udp: allow header check for dodgy GSO_UDP_L4
 packets.

On 9/7/22 6:50 AM, Andrew Melnychenko wrote:
> diff --git a/net/ipv4/udp_offload.c b/net/ipv4/udp_offload.c
> index 6d1a4bec2614..8e002419b4d5 100644
> --- a/net/ipv4/udp_offload.c
> +++ b/net/ipv4/udp_offload.c
> @@ -387,7 +387,7 @@ static struct sk_buff *udp4_ufo_fragment(struct sk_buff *skb,
>  	if (!pskb_may_pull(skb, sizeof(struct udphdr)))
>  		goto out;
>  
> -	if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4)
> +	if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4 && !skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST))

that line needs to be wrapped.

>  		return __udp_gso_segment(skb, features, false);
>  
>  	mss = skb_shinfo(skb)->gso_size;