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

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Date:   Thu, 11 Jan 2018 12:37:28 -0800
From:   Ray Jui <ray.jui@...adcom.com>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....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

Hi Lorenzo,

On 1/11/2018 9:15 AM, Lorenzo Pieralisi wrote:
> 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 >

Will fix.

>> 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.

Will fix.

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

Okay will send out v2 with comments from you addressed. Thanks!

> 
> Thanks,
> Lorenzo
>