linux-kernel - Re: [PATCH] resource: Fix the case of null pointer access

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Message-ID: <20140812150417.GC16961@redhat.com>
Date:	Tue, 12 Aug 2014 11:04:17 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Richard Weinberger <richard@....at>
Cc:	linux kernel mailing list <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Daniel Walter <sahne@...0.at>,
	Toralf Förster <toralf.foerster@....de>,
	user-mode-linux-devel <user-mode-linux-devel@...ts.sourceforge.net>
Subject: Re: [PATCH] resource: Fix the case of null pointer access

On Tue, Aug 12, 2014 at 04:49:35PM +0200, Richard Weinberger wrote:
> Am 12.08.2014 16:46, schrieb Vivek Goyal:
> > Richard and Daniel reported that UML is broken due to changes to resource
> > traversal functions. Problem is that iomem_resource.child can be null
> > and new code does not consider that possibility. Old code used a for loop
> > and that loop will not even execute if p was null.
> > 
> > Revert back to for() loop logic and bail out if p is null.
> > 
> > I also moved sibling_only check out of resource_lock. There is no
> > reason to keep it inside the lock.
> > 
> > Following is backtrace of the UML crash.
> 
> Shall I pickup this patch and route it via my uml tree to Linus?

I am fine with that. 

Thanks
Vivek
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