Re: [PATCH v2] vmw_balloon: fixing double free when batching mode is off

From: Nadav Amit
Date: Wed Apr 18 2018 - 13:54:31 EST

Oleksandr Natalenko <oleksandr@xxxxxxxxxx> wrote:

> Hello.
> On Fri, Mar 23, 2018 at 9:42 AM, Oleksandr Natalenko
> <oleksandr@xxxxxxxxxx> wrote:
>>> Actually, rechecking the bug description, I might have rushed. The bug that
>>> I encountered is related to the vunmap() but it is only caused when batching
>>> is off, while the bug you reported has batching on.
>>> It seems that your sources support batching but do not include b91f108a3d54
>>> (âVMware balloon: Treat init like resetâ), which I think would have solved
>>> the problem. I donât see a mainline kernel that supports batching and does
>>> not have this patch, so it would be helpful to see the exact module that you
>>> use.
>> Correct. The hash is d7568c130d0d0ff1fc5b364fc879b91f108a3d54, actually, though.
>> Yes, we miss this commit in our code base, but also we've already
>> provided a test kernel
>> with this commit included to the customer. Unfortunately, we have no answer yet.
> At least for one customer I can confirm that the kernel built with
> both d7568c130 and the proposed patch fixes the issue.


Can you commit please this patch? Preferably for 4.17?

There is one minor mistake in the commit message - this patch fixes
f220a80f0c2e and not as written. Please let me know if you want a v3 or can
amend it while committing.