Re: [Qemu-devel] [PATCH for-2.10-rc4?] acpi: pcihp: fix use-after-free for machines previous pc-1.7 compat

["Michael S. Tsirkin" <mst@redhat.com>]

On Wed, Aug 23, 2017 at 07:40:39AM +0200, Thomas Huth wrote:
> On 23.08.2017 02:10, Philippe Mathieu-Daudé wrote:
> > On 08/22/2017 07:42 PM, Michael S. Tsirkin wrote:
> >> On Tue, Aug 22, 2017 at 06:43:43PM -0300, Philippe Mathieu-Daudé wrote:
> >>> 9e047b982452 "piix4: add acpi pci hotplug support" introduced a new
> >>> property
> >>> 'use_acpi_pci_hotplug' for pc-1.7 and older machines.
> >>> c24d5e0b91d1 "convert ACPI PCI hotplug to use hotplug-handler API"
> >>> added the
> >>> qbus hotplug handlers but forgot to check for the 'use_acpi_pci_hotplug'
> >>> property.
> >>>
> >>> Check for use_acpi_pci_hotplug before calling
> >>> acpi_pcihp_device_[un]plug_cb().
> [...]
> >>> Reported-by: Thomas Huth <thuth@redhat.com>
> >>> Message-Id: <59a56959-ca12-ea75-33fa-ff07eba1b090@redhat.com>
> >>> Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
> >>
> >> Looks like this is a very old bug, isn't it?
> >> Objections to merging this after the release?
> > 
> > Yes, I'm also inclined to delay it so we can release 2.10, I tagged
> > "2.10-rc4" since Thomas sent it as a bug within the 2.10 window so I'll
> > let him decide if it is worth crying wolf :) It's very likely no-one but
> > him used pre-pc-i440fx-1.7 the last 3 years, not even thinking about hot
> > plugging AHCI devices :D
> 
> I'm fine if this gets included in 2.11 - it's quite unlikely that a user
> tries hot-plug ahci on such an old machine type, I think. But we maybe
> should include this in the 2.10.1 stable release, so I'm putting
> qemu-stable on CC now.
> 
> Anyway, your patch seems to fix the issue for me, thanks!
> 
> Tested-by: Thomas Huth <thuth@redhat.com>

ok, pls remember to repost or ping after the release.