linux-kernel - Re: [PATCH] PCI: iproc: Fix NULL pointer dereference for BCMA

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Message-ID: <20180111171450.GA12148@red-moon>
Date:   Thu, 11 Jan 2018 17:15:02 +0000
From:   Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:     Ray Jui <ray.jui@...adcom.com>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Bjorn Helgaas <helgaas@...nel.org>,
        linux-kernel@...r.kernel.org,
        bcm-kernel-feedback-list@...adcom.com, linux-pci@...r.kernel.org,
        Rafal Milecki <rafal@...ecki.pl>, stable@...r.kernel.org
Subject: Re: [PATCH] PCI: iproc: Fix NULL pointer dereference for BCMA

On Tue, Jan 09, 2018 at 11:45:40AM -0800, Ray Jui wrote:
> With the inbound DMA mapping supported added, the iProc PCIe driver
> parses DT property "dma-ranges" through call to
> "of_pci_dma_range_parser_init". In the case of BCMA, this results in a
> NULL pointer deference due to a missing of_node.
> 
> Fix this by adding a guard in pcie-iproc-platform.c to only enable the
> inbound DMA mapping logic when DT property "dma-ranges" is present
> 
> fixes: dd9d4e7498de3 ("PCI: iproc: Add inbound DMA mapping support")

s/fixes/Fixes

> Reported-by: Rafał Miłecki <rafal@...ecki.pl>
> Signed-off-by: Ray Jui <ray.jui@...adcom.com>
> Tested-by: Rafał Miłecki <rafal@...ecki.pl>
> Cc: <stable@...r.kernel.org> # 4.10+
> ---
>  drivers/pci/host/pcie-iproc-platform.c | 3 +++
>  drivers/pci/host/pcie-iproc.c          | 8 +++++---
>  drivers/pci/host/pcie-iproc.h          | 2 ++
>  3 files changed, 10 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/pci/host/pcie-iproc-platform.c b/drivers/pci/host/pcie-iproc-platform.c
> index a5073a9..235c545 100644
> --- a/drivers/pci/host/pcie-iproc-platform.c
> +++ b/drivers/pci/host/pcie-iproc-platform.c
> @@ -92,6 +92,9 @@ static int iproc_pcie_pltfm_probe(struct platform_device *pdev)
>  		pcie->need_ob_cfg = true;
>  	}
>  
> +	if (of_property_read_bool(np, "dma-ranges"))
> +		pcie->need_ib_cfg = true;

Nit:
	pci->need_ib_cfg = of_property_read_bool(np, "dma-ranges"));

will do. Add a comment to it to explain why it is needed.

Please update the patch, send a v2 and I will merge it.

Thanks,
Lorenzo

> +
>  	/* PHY use is optional */
>  	pcie->phy = devm_phy_get(dev, "pcie-phy");
>  	if (IS_ERR(pcie->phy)) {
> diff --git a/drivers/pci/host/pcie-iproc.c b/drivers/pci/host/pcie-iproc.c
> index 935909b..7583606 100644
> --- a/drivers/pci/host/pcie-iproc.c
> +++ b/drivers/pci/host/pcie-iproc.c
> @@ -1378,9 +1378,11 @@ int iproc_pcie_setup(struct iproc_pcie *pcie, struct list_head *res)
>  		}
>  	}
>  
> -	ret = iproc_pcie_map_dma_ranges(pcie);
> -	if (ret && ret != -ENOENT)
> -		goto err_power_off_phy;
> +	if (pcie->need_ib_cfg) {
> +		ret = iproc_pcie_map_dma_ranges(pcie);
> +		if (ret && ret != -ENOENT)
> +			goto err_power_off_phy;
> +	}
>  
>  #ifdef CONFIG_ARM
>  	pcie->sysdata.private_data = pcie;
> diff --git a/drivers/pci/host/pcie-iproc.h b/drivers/pci/host/pcie-iproc.h
> index a6b55ce..4ac6282 100644
> --- a/drivers/pci/host/pcie-iproc.h
> +++ b/drivers/pci/host/pcie-iproc.h
> @@ -74,6 +74,7 @@ struct iproc_msi;
>   * @ob: outbound mapping related parameters
>   * @ob_map: outbound mapping related parameters specific to the controller
>   *
> + * @need_ib_cfg: indicates SW needs to configure the inbound mapping window
>   * @ib: inbound mapping related parameters
>   * @ib_map: outbound mapping region related parameters
>   *
> @@ -101,6 +102,7 @@ struct iproc_pcie {
>  	struct iproc_pcie_ob ob;
>  	const struct iproc_pcie_ob_map *ob_map;
>  
> +	bool need_ib_cfg;
>  	struct iproc_pcie_ib ib;
>  	const struct iproc_pcie_ib_map *ib_map;
>  
> -- 
> 2.1.4
>