netdev - Re: [bpf-net PATCH v2] bpf: sockmap missing NULL psock check

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Message-ID: <860f27aa-38c2-8655-2dca-e6aca89c41f7@iogearbox.net>
Date:   Sun, 7 Jan 2018 00:08:18 +0100
From:   Daniel Borkmann <daniel@...earbox.net>
To:     John Fastabend <john.fastabend@...il.com>, borkmann@...earbox.net,
        alexei.starovoitov@...il.com
Cc:     netdev@...r.kernel.org
Subject: Re: [bpf-net PATCH v2] bpf: sockmap missing NULL psock check

On 01/05/2018 05:02 AM, John Fastabend wrote:
> Add psock NULL check to handle a racing sock event that can get the
> sk_callback_lock before this case but after xchg happens causing the
> refcnt to hit zero and sock user data (psock) to be null and queued
> for garbage collection.
> 
> Also add a comment in the code because this is a bit subtle and
> not obvious in my opinion.
> 
> Signed-off-by: John Fastabend <john.fastabend@...il.com>

Applied to bpf, thanks John!