linux-kernel - Re: [PATCH net] rxrpc: Fix possible NULL pointer access in ICMP handling

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Message-Id: <20191011.212124.1517786431494477849.davem@davemloft.net>
Date:   Fri, 11 Oct 2019 21:21:24 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     dhowells@...hat.com
Cc:     netdev@...r.kernel.org, linux-afs@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] rxrpc: Fix possible NULL pointer access in ICMP
 handling

From: David Howells <dhowells@...hat.com>
Date: Thu, 10 Oct 2019 15:52:34 +0100

> If an ICMP packet comes in on the UDP socket backing an AF_RXRPC socket as
> the UDP socket is being shut down, rxrpc_error_report() may get called to
> deal with it after sk_user_data on the UDP socket has been cleared, leading
> to a NULL pointer access when this local endpoint record gets accessed.
> 
> Fix this by just returning immediately if sk_user_data was NULL.
> 
> The oops looks like the following:
 ...
> Fixes: 17926a79320a ("[AF_RXRPC]: Provide secure RxRPC sockets for use by userspace and kernel both")
> Reported-by: syzbot+611164843bd48cc2190c@...kaller.appspotmail.com
> Signed-off-by: David Howells <dhowells@...hat.com>

Applied and queued up for -stable, thanks.