Re: [PATCHv2 1/4] PCI: dwc: fix potential memory leak

[Lorenzo Pieralisi]

On Wed, Nov 07, 2018 at 10:09:04AM +0000, Z.q. Hou wrote:
> From: Hou Zhiqiang <Zhiqiang.Hou@xxxxxxx>
> 
> Free the allocated pci_host_bridge struct when failed to get
> host bridge resources, and free the resource windows before
> free the bridge.
> 
> Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@xxxxxxx>
> Acked-by: Gustavo Pimentel <gustavo.pimentel@xxxxxxxxxxxx>
> ---
> V2:
>  - Reworded the subject.
> 
>  drivers/pci/controller/dwc/pcie-designware-host.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
> index 29a05759a294..ecacce016489 100644
> --- a/drivers/pci/controller/dwc/pcie-designware-host.c
> +++ b/drivers/pci/controller/dwc/pcie-designware-host.c
> @@ -353,7 +353,7 @@ int dw_pcie_host_init(struct pcie_port *pp)
>  	ret = devm_of_pci_get_host_bridge_resources(dev, 0, 0xff,
>  					&bridge->windows, &pp->io_base);
>  	if (ret)
> -		return ret;
> +		goto error;
>  
>  	ret = devm_request_pci_bus_resources(dev, &bridge->windows);
>  	if (ret)
> @@ -502,6 +502,7 @@ int dw_pcie_host_init(struct pcie_port *pp)
>  	return 0;
>  
>  error:
> +	pci_free_resource_list(&bridge->windows);

This would cause a double-free, devm_request_pci_bus_resource already
takes care of freeing resources, patch dropped.

Lorenzo

>  	pci_free_host_bridge(bridge);
>  	return ret;
>  }
> -- 
> 2.17.1
>