linux-kernel - Re: [PATCH V4 2/4] kvm: fix double free for fast mmio eventfd

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Date:	Fri, 11 Sep 2015 12:19:35 +0200
From:	Cornelia Huck <cornelia.huck@...ibm.com>
To:	Jason Wang <jasowang@...hat.com>
Cc:	gleb@...nel.org, pbonzini@...hat.com, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, mst@...hat.com
Subject: Re: [PATCH V4 2/4] kvm: fix double free for fast mmio eventfd

On Fri, 11 Sep 2015 17:25:45 +0800
Jason Wang <jasowang@...hat.com> wrote:

> On 09/11/2015 03:46 PM, Cornelia Huck wrote:
> > On Fri, 11 Sep 2015 11:17:35 +0800
> > Jason Wang <jasowang@...hat.com> wrote:

> >> +
> >> +	/* When length is ignored, MMIO is also put on a separate bus, for
> >> +	 * faster lookups.
> >> +	 */
> >> +	if (!args->len && !(args->flags & KVM_IOEVENTFD_FLAG_PIO)) {
> > Dito on a positive check for bus_idx == KVM_MMIO_BUS.
> 
> I was thinking maybe this should be done in a separate patch on top.
> What's your opinion?

The check is an independent issue, an extra patch is fine (current
usage does not trigger any problems).

> 
> >> +		ret = kvm_assign_ioeventfd_idx(kvm, KVM_FAST_MMIO_BUS, args);
> >> +		if (ret < 0)
> >> +			goto fast_fail;
> >> +	}

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