Re: [PATCH v6 3/4] iommufd: Add IOMMU_GET_HW_INFO

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On 2023/8/8 23:35, Yi Liu wrote:
+static int iommufd_fill_hw_info(struct device *dev, void __user *user_ptr,
+				unsigned int *length, u32 *type)
+{
+	const struct iommu_ops *ops;
+	unsigned int data_len;
+	void *data;
+	int rc = 0;
+
+	ops = dev_iommu_ops(dev);
+	if (!ops->hw_info) {
+		*length = 0;
+		*type = IOMMU_HW_INFO_TYPE_NONE;
+		return 0;
+	}
+
+	data = ops->hw_info(dev, &data_len, type);
+	if (IS_ERR(data))
+		return PTR_ERR(data);
+
+	/*
+	 * drivers that have hw_info callback should have a unique
+	 * iommu_hw_info_type.
+	 */
+	if (WARN_ON_ONCE(*type == IOMMU_HW_INFO_TYPE_NONE)) {
+		rc = -ENODEV;
+		goto err_free;
+	}
+
+	*length = min(*length, data_len);
+	if (copy_to_user(user_ptr, data, *length)) {

copy_to_user() returns the number of bytes that were successfully
copied, right?

If so, isn't it always failure case? Or I missed anything?

+		rc = -EFAULT;
+		goto err_free;

nit: this goto is unnecessary.

+	}
+
+err_free:
+	kfree(data);
+	return rc;
+}

Best regards,
baolu



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