netdev - Re: [PATCH net-next] net: psp: don't assume reply skbs will have a socket

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Message-ID: <CANn89i+9vHQEx4NFSdPGNn-LtM+rxaizcuh=0BtP3EYVQr73KQ@mail.gmail.com>
Date: Wed, 1 Oct 2025 23:41:31 -0700
From: Eric Dumazet <edumazet@...gle.com>
To: Kuniyuki Iwashima <kuniyu@...gle.com>
Cc: Jakub Kicinski <kuba@...nel.org>, davem@...emloft.net, netdev@...r.kernel.org, 
	pabeni@...hat.com, andrew+netdev@...n.ch, horms@...nel.org, 
	ncardwell@...gle.com, daniel.zahka@...il.com, willemb@...gle.com
Subject: Re: [PATCH net-next] net: psp: don't assume reply skbs will have a socket

On Wed, Oct 1, 2025 at 11:28 PM Kuniyuki Iwashima <kuniyu@...gle.com> wrote:
>
> On Tue, Sep 30, 2025 at 7:24 PM Jakub Kicinski <kuba@...nel.org> wrote:
> >
> > Rx path may be passing around unreferenced sockets, which means
> > that skb_set_owner_edemux() may not set skb->sk and PSP will crash:
> >
> >   KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]
> >   RIP: 0010:psp_reply_set_decrypted (./include/net/psp/functions.h:132 net/psp/psp_sock.c:287)
> >     tcp_v6_send_response.constprop.0 (net/ipv6/tcp_ipv6.c:979)
> >     tcp_v6_send_reset (net/ipv6/tcp_ipv6.c:1140 (discriminator 1))
> >     tcp_v6_do_rcv (net/ipv6/tcp_ipv6.c:1683)
> >     tcp_v6_rcv (net/ipv6/tcp_ipv6.c:1912)
> >
> > Fixes: 659a2899a57d ("tcp: add datapath logic for PSP with inline key exchange")
> > Signed-off-by: Jakub Kicinski <kuba@...nel.org>
>
> Reviewed-by: Kuniyuki Iwashima <kuniyu@...gle.com>

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