Re: mm: NULL ptr deref in anon_vma_interval_tree_verify

[Michel Lespinasse]

On Sun, Nov 4, 2012 at 8:44 PM, Michel Lespinasse <walken@xxxxxxxxxx> wrote:
> On Sun, Nov 4, 2012 at 8:14 PM, Bob Liu <lliubbo@xxxxxxxxx> wrote:
>> Hmm, I attached a simple fix patch.
>
> Reviewed-by: Michel Lespinasse <walken@xxxxxxxxxx>
> (also ran some tests with it, but I could never reproduce the original
> issue anyway).

Wait a minute, this is actually wrong. You need to call
vma_lock_anon_vma() / vma_unlock_anon_vma() to avoid the issue with
vma->anon_vma == NULL.

I'll fix it and integrate it into my next patch series, which I intend
to send later today. (I am adding new code into validate_mm(), so that
it's easier to have it in the same patch series to avoid merge
conflicts)

-- 
Michel "Walken" Lespinasse
A program is never fully debugged until the last user dies.
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