netdev - Re: [PATCH v1 net 2/2] fou: Don't allow 0 for FOU_ATTR

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Message-ID: <CANn89iJxrbDkUM+MRParMrvJzDY3DS+OFmXecN8oq+cKMp7zJQ@mail.gmail.com>
Date: Mon, 12 Jan 2026 21:25:58 +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>, 
	Tom Herbert <therbert@...gle.com>, Kuniyuki Iwashima <kuni1840@...il.com>, netdev@...r.kernel.org
Subject: Re: [PATCH v1 net 2/2] fou: Don't allow 0 for FOU_ATTR_IPPROTO.

On Mon, Jan 12, 2026 at 9:07 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>