netdev - Re: [PATCH v2 net 3/3] fou: Don't allow 0 for FOU_ATTR

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Message-ID: <CANn89iKhXwBGZo4SUBXTjcM9zEfEjSK2QF3RXPCd=mMkTMcgkQ@mail.gmail.com>
Date: Thu, 15 Jan 2026 18:27:48 +0100
From: Eric Dumazet <edumazet@...gle.com>
To: Kuniyuki Iwashima <kuniyu@...gle.com>
Cc: "David S . Miller" <davem@...emloft.net>, David Ahern <dsahern@...nel.org>, 
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>, 
	Kuniyuki Iwashima <kuni1840@...il.com>, netdev@...r.kernel.org
Subject: Re: [PATCH v2 net 3/3] fou: Don't allow 0 for FOU_ATTR_IPPROTO.

On Thu, Jan 15, 2026 at 6:25 PM Kuniyuki Iwashima <kuniyu@...gle.com> wrote:
>
> fou_udp_recv() has the same problem mentioned in the previous
> patch.
>
> If FOU_ATTR_IPPROTO is set to 0, skb is not freed by
> fou_udp_recv() nor "resubmit"-ted in ip_protocol_deliver_rcu().
>
> Let's forbid 0 for FOU_ATTR_IPPROTO.
>
> Fixes: 23461551c0062 ("fou: Support for foo-over-udp RX path")
> Signed-off-by: Kuniyuki Iwashima <kuniyu@...gle.com>
> ---

Reviewed-by: Eric Dumazet <edumazet@...gle.com>