linux-kernel - Re: [PATCH] kernel/smp: Fix an off by one in csd_lock_wait

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Message-ID: <20200709114900.b475kfqz3447zgfg@linutronix.de>
Date:   Thu, 9 Jul 2020 13:49:00 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Dan Carpenter <dan.carpenter@...cle.com>,
        Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Kaitao Cheng <pilgrimtao@...il.com>,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] kernel/smp: Fix an off by one in csd_lock_wait_toolong()

On 2020-07-09 12:59:06 [+0200], Peter Zijlstra wrote:
> On Thu, Jul 09, 2020 at 01:48:18PM +0300, Dan Carpenter wrote:
> > The __per_cpu_offset[] array has "nr_cpu_ids" elements so change the >
> > >= to prevent a read one element beyond the end of the array.
> > 
> > Fixes: 0504bc41a62c ("kernel/smp: Provide CSD lock timeout diagnostics")
> 
> I don't have a copy of that patch in my inbox, even though it says Cc:
> me.
> 
> Paul, where do you expect that patch to go? The version I see from my
> next tree needs a _lot_ of work.

There is also
 
 https://lkml.kernel.org/r/20200705082603.GX3874@shao2-debian
 https://lkml.kernel.org/r/00000000000042f21905a991ecea@google.com

it might be the same thing.

Sebastian