linux-kernel - Re: [PATCH v2]iommu/qcom:fix local

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Date:   Sun, 19 Apr 2020 21:52:37 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Tang Bin <tangbin@...s.chinamobile.com>
Cc:     joro@...tes.org, agross@...nel.org, robdclark@...il.com,
        linux-arm-msm@...r.kernel.org, iommu@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2]iommu/qcom:fix local_base status check

On Sat 18 Apr 06:47 PDT 2020, Tang Bin wrote:

> The function qcom_iommu_device_probe() does not perform sufficient
> error checking after executing devm_ioremap_resource(), which can
> result in crashes if a critical error path is encountered.
> 

Thanks, that's much better.

Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>

Regards,
Bjorn

> Fixes: 0ae349a0f33f ("iommu/qcom: Add qcom_iommu")
> 
> Signed-off-by: Tang Bin <tangbin@...s.chinamobile.com>
> ---
> v2:
>  - fix commit message and add fixed tag
> ---
>  drivers/iommu/qcom_iommu.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/iommu/qcom_iommu.c b/drivers/iommu/qcom_iommu.c
> index 4328da0b0..b160cf140 100644
> --- a/drivers/iommu/qcom_iommu.c
> +++ b/drivers/iommu/qcom_iommu.c
> @@ -813,8 +813,11 @@ static int qcom_iommu_device_probe(struct platform_device *pdev)
>  	qcom_iommu->dev = dev;
>  
>  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> -	if (res)
> +	if (res) {
>  		qcom_iommu->local_base = devm_ioremap_resource(dev, res);
> +		if (IS_ERR(qcom_iommu->local_base))
> +			return PTR_ERR(qcom_iommu->local_base);
> +	}
>  
>  	qcom_iommu->iface_clk = devm_clk_get(dev, "iface");
>  	if (IS_ERR(qcom_iommu->iface_clk)) {
> -- 
> 2.20.1.windows.1
> 
> 
>