netdev - Re: [PATCH net] ipv6: restrict IPV6

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Date:   Wed, 26 Feb 2020 20:21:43 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     edumazet@...gle.com
Cc:     netdev@...r.kernel.org, eric.dumazet@...il.com,
        syzbot+1938db17e275e85dc328@...kaller.appspotmail.com,
        daniel@...earbox.net
Subject: Re: [PATCH net] ipv6: restrict IPV6_ADDRFORM operation

From: Eric Dumazet <edumazet@...gle.com>
Date: Tue, 25 Feb 2020 11:52:29 -0800

> IPV6_ADDRFORM is able to transform IPv6 socket to IPv4 one.
> While this operation sounds illogical, we have to support it.
> 
> One of the things it does for TCP socket is to switch sk->sk_prot
> to tcp_prot.
> 
> We now have other layers playing with sk->sk_prot, so we should make
> sure to not interfere with them.
> 
> This patch makes sure sk_prot is the default pointer for TCP IPv6 socket.
  ...
> Fixes: 604326b41a6f ("bpf, sockmap: convert to generic sk_msg interface")
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Reported-by: syzbot+1938db17e275e85dc328@...kaller.appspotmail.com

Applied and queued up for -stable, thanks Eric.