netdev - Re: [PATCH net 1/2] rxrpc: Fix a race between socket set up and I/O thread creation

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Message-ID: <CANn89iKp47BVt0uGEbCuhEhYvMDy=6+cpp5PQTNQewPWxr_vyg@mail.gmail.com>
Date: Tue, 1 Oct 2024 15:28:57 +0200
From: Eric Dumazet <edumazet@...gle.com>
To: David Howells <dhowells@...hat.com>
Cc: netdev@...r.kernel.org, Marc Dionne <marc.dionne@...istor.com>, 
	"David S. Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
	linux-afs@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	yuxuanzhe@...look.com, Simon Horman <horms@...nel.org>
Subject: Re: [PATCH net 1/2] rxrpc: Fix a race between socket set up and I/O
 thread creation

On Tue, Oct 1, 2024 at 3:27 PM David Howells <dhowells@...hat.com> wrote:
>
> In rxrpc_open_socket(), it sets up the socket and then sets up the I/O
> thread that will handle it.  This is a problem, however, as there's a gap
> between the two phases in which a packet may come into rxrpc_encap_rcv()
> from the UDP packet but we oops when trying to wake the not-yet created I/O
> thread.
>
> As a quick fix, just make rxrpc_encap_rcv() discard the packet if there's
> no I/O thread yet.
>
> A better, but more intrusive fix would perhaps be to rearrange things such
> that the socket creation is done by the I/O thread.
>
> Fixes: a275da62e8c1 ("rxrpc: Create a per-local endpoint receive queue and I/O thread")
> Signed-off-by: David Howells <dhowells@...hat.com>

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