linux-kernel - Re: [PATCH 4.2.y-ckt 161/305] um: Fix get

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Date:	Tue, 19 Jan 2016 08:05:56 -0800
From:	Kamal Mostafa <kamal@...onical.com>
To:	Richard Weinberger <richard@....at>
Cc:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Subject: Re: [PATCH 4.2.y-ckt 161/305] um: Fix get_signal() usage

On Sat, 2016-01-16 at 21:44 +0100, Richard Weinberger wrote:
> Am 16.01.2016 um 00:59 schrieb Kamal Mostafa:
> > 4.2.8-ckt2 -stable review patch.  If anyone has any objections, please let me know.
> > 
> > ---8<------------------------------------------------------------
> > 
> > From: Richard Weinberger <richard@....at>
> > 
> > commit db2f24dc240856fb1d78005307f1523b7b3c121b upstream.
> > 
> > If get_signal() returns us a signal to post
> > we must not call it again, otherwise the already
> > posted signal will be overridden.
> > Before commit a610d6e672d this was the case as we stopped
> > the while after a successful handle_signal().
> > 
> > Fixes: a610d6e672d ("pull clearing RESTORE_SIGMASK into block_sigmask()")
> > Signed-off-by: Richard Weinberger <richard@....at>
> > Signed-off-by: Kamal Mostafa <kamal@...onical.com>
> > ---
> >  arch/um/kernel/signal.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/arch/um/kernel/signal.c b/arch/um/kernel/signal.c
> > index 4f60e4a..50b6e9f 100644
> > --- a/arch/um/kernel/signal.c
> > +++ b/arch/um/kernel/signal.c
> > @@ -69,7 +69,7 @@ static int kern_do_signal(struct pt_regs *regs)
> >  	struct ksignal ksig;
> >  	int handled_sig = 0;
> >  
> > -	while (get_signal(&ksig)) {
> > +	if (get_signal(&ksig)) {
> >  		handled_sig = 1;
> >  		/* Whee!  Actually deliver the signal.  */
> >  		handle_signal(&ksig, regs);
> > 
> 
> Please drop this patch, it will be reverted from Linus' tree soon.


Dropped from 4.2-stable.  Thanks Richard!

 -Kamal