netdev - Re: [PATCH net v2] net-timestamp: make sk_tskey more predictable in error path

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Message-ID: <567a7062-9b4a-42dd-a8da-e60f948a62f0@linux.dev>
Date: Mon, 12 Feb 2024 23:44:53 +0000
From: Vadim Fedorenko <vadim.fedorenko@...ux.dev>
To: Willem de Bruijn <willemdebruijn.kernel@...il.com>,
 Vadim Fedorenko <vadfed@...a.com>, Andy Lutomirski <luto@...capital.net>
Cc: Jakub Kicinski <kuba@...nel.org>, "David S . Miller"
 <davem@...emloft.net>, Willem de Bruijn <willemb@...gle.com>,
 netdev@...r.kernel.org
Subject: Re: [PATCH net v2] net-timestamp: make sk_tskey more predictable in
 error path

On 12/02/2024 11:19, Willem de Bruijn wrote:
> Vadim Fedorenko wrote:
>> When SOF_TIMESTAMPING_OPT_ID is used to ambiguate timestamped datagrams,
>> the sk_tskey can become unpredictable in case of any error happened
>> during sendmsg(). Move increment later in the code and make decrement of
>> sk_tskey in error path. This solution is still racy in case of multiple
>> threads doing snedmsg() over the very same socket in parallel, but still
>> makes error path much more predictable.
>>
>> Fixes: 09c2d251b707 ("net-timestamp: add key to disambiguate concurrent datagrams")
>> Reported-by: Andy Lutomirski <luto@...capital.net>
>> Signed-off-by: Vadim Fedorenko <vadfed@...a.com>
> 
> What is the difference with v1?

Ah, sorry, was in a rush.

v1 -> v2:
  - use local boolean variable instead of checking the same conditions 
twice.