[openeuler:OLK-6.6 1590/1590] drivers/virt/coco/csv-guest/csv-guest.c:39:43: sparse: sparse: incorrect type in argument 2 (different address spaces)

[kernel test robot <lkp@intel.com>]

tree:   https://gitee.com/openeuler/kernel.git OLK-6.6
head:   a2c7a5a53b2787fa56e28a271e9d3894f70e8374
commit: be5ee944496f8e6f9b5d12ef9ce89ab7100fc84a [1590/1590] driver/virt/coco: Add HYGON CSV Guest dirver.
config: x86_64-randconfig-121 (https://download.01.org/0day-ci/archive/20241205/202412050642.ZbO2qNHp-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241205/202412050642.ZbO2qNHp-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202412050642.ZbO2qNHp-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> drivers/virt/coco/csv-guest/csv-guest.c:39:43: sparse: sparse: incorrect type in argument 2 (different address spaces) @@     expected void const [noderef] __user *from @@     got unsigned char [usertype] *[addressable] report_data @@
   drivers/virt/coco/csv-guest/csv-guest.c:39:43: sparse:     expected void const [noderef] __user *from
   drivers/virt/coco/csv-guest/csv-guest.c:39:43: sparse:     got unsigned char [usertype] *[addressable] report_data
>> drivers/virt/coco/csv-guest/csv-guest.c:49:29: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected void [noderef] __user *to @@     got unsigned char [usertype] *[addressable] report_data @@
   drivers/virt/coco/csv-guest/csv-guest.c:49:29: sparse:     expected void [noderef] __user *to
   drivers/virt/coco/csv-guest/csv-guest.c:49:29: sparse:     got unsigned char [usertype] *[addressable] report_data

vim +39 drivers/virt/coco/csv-guest/csv-guest.c

    19	
    20	static long csv_get_report(void __user *argp)
    21	{
    22		u8	*csv_report;
    23		long	ret;
    24		struct	csv_report_req req;
    25	
    26		if (copy_from_user(&req, argp, sizeof(struct csv_report_req)))
    27			return -EFAULT;
    28	
    29		if (req.len < CSV_REPORT_INPUT_DATA_LEN)
    30			return -EINVAL;
    31	
    32		csv_report = kzalloc(req.len, GFP_KERNEL);
    33		if (!csv_report) {
    34			ret = -ENOMEM;
    35			goto out;
    36		}
    37	
    38		/* Save user input data */
  > 39		if (copy_from_user(csv_report, req.report_data, CSV_REPORT_INPUT_DATA_LEN)) {
    40			ret = -EFAULT;
    41			goto out;
    42		}
    43	
    44		/* Generate CSV_REPORT using "KVM_HC_VM_ATTESTATION" VMMCALL */
    45		ret = kvm_hypercall2(KVM_HC_VM_ATTESTATION, __pa(csv_report), req.len);
    46		if (ret)
    47			goto out;
    48	
  > 49		if (copy_to_user(req.report_data, csv_report, req.len))
    50			ret = -EFAULT;
    51	
    52	out:
    53		kfree(csv_report);
    54		return ret;
    55	}
    56	

-- 
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