linux-kernel - Re: kernel/irq: Null-ptr deref on handle_irq_event

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Date:	Wed, 16 Mar 2016 16:35:34 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Baozeng Ding <sploving1@...il.com>
cc:	linux-kernel@...r.kernel.org,
	Red Hat Product Security <secalert@...hat.com>
Subject: Re: kernel/irq: Null-ptr deref on handle_irq_event_percpu function

On Wed, 16 Mar 2016, Baozeng Ding wrote:

> +linux-kernel and irq maitainer.
> 
> On Thu, Feb 25, 2016 at 04:16:10AM -0500, Red Hat Product Security wrote:
> > >
> > > I cannot produce the bug, but by taking a look at the
> > > code(irq/handle.c line176), it may
> > > casue a null pointer deref:
> > >
> > > http://lxr.free-electrons.com/source/kernel/irq/handle.c#L176

That's the upstream code which is different from what you are pasting.

> > > 174 retval |= res;
> > > 175 action = action->next;
> > > 176 } while (action); //when action is null, it will
> > > //cause a null pointer deref.

That lacks upstream commit 570540d507 or stable 4.4.y commit 827685a637

Thanks,

	tglx