linux-kernel - Re: [PATCH 1/1] powerpc/kvm/book3s: Fixes possible 'use after release' of kvm

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Message-ID: <7dd89f27e886fc73e3de4d2a92e27f443978f318.camel@linux.ibm.com>
Date:   Wed, 27 Nov 2019 17:18:57 -0300
From:   Leonardo Bras <leonardo@...ux.ibm.com>
To:     Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        kvm-ppc@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     Paul Mackerras <paulus@...abs.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Radim Krčmář <rkrcmar@...hat.com>
Subject: Re: [PATCH 1/1] powerpc/kvm/book3s: Fixes possible 'use after
 release' of kvm

On Wed, 2019-11-27 at 17:40 +0100, Paolo Bonzini wrote:
> >   
> >        if (ret >= 0)
> >                list_add_rcu(&stt->list, &kvm->arch.spapr_tce_tables);
> > -     else
> > -             kvm_put_kvm(kvm);
> >   
> >        mutex_unlock(&kvm->lock);
> >   
> >        if (ret >= 0)
> >                return ret;
> >   
> > +     kvm_put_kvm(kvm);
> >        kfree(stt);
> >    fail_acct:
> >        account_locked_vm(current->mm, kvmppc_stt_pages(npages), false);
> 
> This part is a good change, as it makes the code clearer.  The
> virt/kvm/kvm_main.c bits, however, are not necessary as explained by Sean.
> 

Thanks!
So, like this patch?
https://lkml.org/lkml/2019/11/7/763

Best regards,

Leonardo

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