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

From: Richard Weinberger
Date: Tue Aug 12 2014 - 13:38:16 EST

Am 12.08.2014 17:04, schrieb Vivek Goyal:
> 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.

Whoops, I oversaw that your patch does not touch anything in arch/um/.
It is not UML specific. Let's see what Andrew says.

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