Messages in this thread | | | Subject | Re: [PATCH v2] iommu/qcom: Fix local_base status check | From | Markus Elfring <> | Date | Sun, 19 Apr 2020 14:32:20 +0200 |
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> 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.
Your update suggestion will be rechecked once more.
* Can it be that the patch would need a higher version number according to previous review comments?
* Would you like to adjust the patch subject?
… > +++ 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)
I find the deletion of this check appropriate.
> + if (res) { > qcom_iommu->local_base = devm_ioremap_resource(dev, res);
But I do not see a need to preserve such a check because this function performs input parameter validation. https://elixir.bootlin.com/linux/v5.7-rc1/source/lib/devres.c#L116 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/lib/devres.c?id=50cc09c18985eacbbd666acfd7be2391394733f5#n116
Please take another look at a corresponding usage example.
Regards, Markus
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