linux-kernel - Re: [PATCH v1 03/16] iommu: Add iommu_copy_struct_to

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Message-ID: <86881827-8E2D-461C-BDA3-FA8FD14C343C@nvidia.com>
Date: Mon, 14 Apr 2025 15:25:40 +0000
From: Matt Ochs <mochs@...dia.com>
To: Nicolin Chen <nicolinc@...dia.com>
CC: Jason Gunthorpe <jgg@...dia.com>, Kevin Tian <kevin.tian@...el.com>,
	"corbet@....net" <corbet@....net>, Will Deacon <will@...nel.org>,
	"robin.murphy@....com" <robin.murphy@....com>, "joro@...tes.org"
	<joro@...tes.org>, "thierry.reding@...il.com" <thierry.reding@...il.com>,
	Krishna Reddy <vdumpa@...dia.com>, Jon Hunter <jonathanh@...dia.com>,
	"shuah@...nel.org" <shuah@...nel.org>, "praan@...gle.com" <praan@...gle.com>,
	"nathan@...nel.org" <nathan@...nel.org>, "peterz@...radead.org"
	<peterz@...radead.org>, "yi.l.liu@...el.com" <yi.l.liu@...el.com>,
	"jsnitsel@...hat.com" <jsnitsel@...hat.com>, "mshavit@...gle.com"
	<mshavit@...gle.com>, "zhangzekun11@...wei.com" <zhangzekun11@...wei.com>,
	"iommu@...ts.linux.dev" <iommu@...ts.linux.dev>, "linux-doc@...r.kernel.org"
	<linux-doc@...r.kernel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "linux-tegra@...r.kernel.org"
	<linux-tegra@...r.kernel.org>, "linux-kselftest@...r.kernel.org"
	<linux-kselftest@...r.kernel.org>, "patches@...ts.linux.dev"
	<patches@...ts.linux.dev>
Subject: Re: [PATCH v1 03/16] iommu: Add iommu_copy_struct_to_user helper

> On Apr 11, 2025, at 1:37 AM, Nicolin Chen <nicolinc@...dia.com> wrote:
> +__iommu_copy_struct_to_user(const struct iommu_user_data *dst_data,
> +    void *src_data, unsigned int data_type,
> +    size_t data_len, size_t min_len)
> +{
> + if (dst_data->type != data_type)
> + return -EINVAL;
> + if (WARN_ON(!dst_data || !src_data))
> + return -EINVAL;

The NULL pointer check should be first.


-matt