linux-kernel - Re: [PATCH] kvm: x86: mmu: fix memoryleak in kvm_mmu_vendor_module

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Message-ID: <Yw6UuGqIF1op5zYp@google.com>
Date:   Tue, 30 Aug 2022 22:52:40 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     "Huang, Kai" <kai.huang@...el.com>
Cc:     "linmiaohe@...wei.com" <linmiaohe@...wei.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "hpa@...or.com" <hpa@...or.com>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "bp@...en8.de" <bp@...en8.de>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] kvm: x86: mmu: fix memoryleak in
 kvm_mmu_vendor_module_init()

On Tue, Aug 30, 2022, Huang, Kai wrote:
> On Tue, 2022-08-30 at 21:40 +0000, Sean Christopherson wrote:
> > On Tue, Aug 23, 2022, Miaohe Lin wrote:
> > > When register_shrinker() fails, we forgot to release the percpu counter
> 
> > > kvm_total_used_mmu_pages leading to memoryleak. Fix this issue by calling
> > > percpu_counter_destroy() when register_shrinker() fails.
> > > 
> > > Fixes: ab271bd4dfd5 ("x86: kvm: propagate register_shrinker return code")
> > > Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
> > > ---
> > 
> > Pushed to branch `for_paolo/6.1` at:
> > 
> >     https://github.com/sean-jc/linux.git
> > 
> > Unless you hear otherwise, it will make its way to kvm/queue "soon".
> > 
> > Note, the commit IDs are not guaranteed to be stable.
> 
> Sorry for late reply.
> 
> The commit message has "we".  Should we get rid of it?

Avoiding pronouns is obviously my preference, but sometimes even I set aside my
crusade to move things along :-)