linux-kernel - Re: [PATCH 2/4] posix-timers: fix creation race

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Date:	Mon, 13 Aug 2007 09:35:22 +0200
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Oleg Nesterov <oleg@...sign.ru>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	stable@...nel.org
Subject: Re: [PATCH 2/4] posix-timers: fix creation race

On Sun, 2007-08-12 at 23:44 +0400, Oleg Nesterov wrote:
> > > --- t/kernel/posix-timers.c~2_CREATE	2007-08-12 17:59:17.000000000 +0400
> > > +++ t/kernel/posix-timers.c	2007-08-12 18:11:33.000000000 +0400
> > > @@ -547,13 +547,12 @@ sys_timer_create(const clockid_t which_c
> > >  				new_timer->it_process = process;
> > >  				list_add(&new_timer->list,
> > >  					 &process->signal->posix_timers);
> > > -				spin_unlock_irqrestore(&process->sighand->siglock, flags);
> > >  				if (new_timer->it_sigev_notify == (SIGEV_SIGNAL|SIGEV_THREAD_ID))
> > >  					get_task_struct(process);
> > >  			} else {
> > > -				spin_unlock_irqrestore(&process->sighand->siglock, flags);
> > >  				process = NULL;
> > >  			}
> > > +			spin_unlock_irqrestore(&process->sighand->siglock, flags);
> 
> i'll resend this patch tomorrow. We can't do spin_unlock_irqrestore(&process->...)
> if we set process = NULL above.

Doh, half of my brain seems to be still on vacation.

	tglx


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