ACK: [d/azure][PATCH 2/2] UBUNTU: SAUCE: PCI: hv: Fix panic by calling hv_pci_remove_slots() earlier

[Sultan Alsawaf]

On Thu, Aug 08, 2019 at 12:34:53PM -0300, Marcelo Henrique Cerri wrote:
> From: Dexuan Cui <decui at microsoft.com>
> 
> BugLink: https://bugs.launchpad.net/bugs/1837661
> 
> The slot must be removed before the pci_dev is removed, otherwise a panic
> can happen due to use-after-free.
> 
> Fixes: 15becc2b56c6 ("PCI: hv: Add hv_pci_remove_slots() when we unload the driver")
> Signed-off-by: Dexuan Cui <decui at microsoft.com>
> Cc: stable at vger.kernel.org
> Signed-off-by: Marcelo Henrique Cerri <marcelo.cerri at canonical.com>
> ---
>  drivers/pci/controller/pci-hyperv.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/pci/controller/pci-hyperv.c b/drivers/pci/controller/pci-hyperv.c
> index ae91e708796f..3bd94149b9d2 100644
> --- a/drivers/pci/controller/pci-hyperv.c
> +++ b/drivers/pci/controller/pci-hyperv.c
> @@ -2714,8 +2714,8 @@ static int hv_pci_remove(struct hv_device *hdev)
>  		/* Remove the bus from PCI's point of view. */
>  		pci_lock_rescan_remove();
>  		pci_stop_root_bus(hbus->pci_bus);
> -		pci_remove_root_bus(hbus->pci_bus);
>  		hv_pci_remove_slots(hbus);
> +		pci_remove_root_bus(hbus->pci_bus);
>  		pci_unlock_rescan_remove();
>  		hbus->state = hv_pcibus_removed;
>  	}
> -- 
> 2.20.1
> 
> 
> -- 
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Acked-by: Sultan Alsawaf <sultan.alsawaf at canonical.com>