netdev - Re: [PATCH net] rxrpc: use rcu protection while reading sk->sk_user

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Date:   Wed, 16 Oct 2019 12:21:05 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     edumazet@...gle.com
Cc:     netdev@...r.kernel.org, eric.dumazet@...il.com,
        jakub.kicinski@...ronome.com, dhowells@...hat.com
Subject: Re: [PATCH net] rxrpc: use rcu protection while reading
 sk->sk_user_data

From: Eric Dumazet <edumazet@...gle.com>
Date: Mon, 14 Oct 2019 06:04:38 -0700

> We need to extend the rcu_read_lock() section in rxrpc_error_report()
> and use rcu_dereference_sk_user_data() instead of plain access
> to sk->sk_user_data to make sure all rules are respected.
> 
> The compiler wont reload sk->sk_user_data at will, and RCU rules
> prevent memory beeing freed too soon.
> 
> Fixes: f0308fb07080 ("rxrpc: Fix possible NULL pointer access in ICMP handling")
> Fixes: 17926a79320a ("[AF_RXRPC]: Provide secure RxRPC sockets for use by userspace and kernel both")
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Cc: David Howells <dhowells@...hat.com>

Applied, thanks Eric.