Re: [PATCH v1 1/4] misc: fastrpc: Add CRC support using invokeV2 request

[kernel test robot]

Hi Ekansh,

kernel test robot noticed the following build warnings:

[auto build test WARNING on char-misc/char-misc-testing]
[also build test WARNING on char-misc/char-misc-next char-misc/char-misc-linus linus/master v6.12-rc2 next-20241008]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Ekansh-Gupta/misc-fastrpc-Add-CRC-support-using-invokeV2-request/20241007-164734
base:   char-misc/char-misc-testing
patch link:    https://lore.kernel.org/r/20241007084518.3649876-2-quic_ekangupt%40quicinc.com
patch subject: [PATCH v1 1/4] misc: fastrpc: Add CRC support using invokeV2 request
config: alpha-randconfig-r112-20241008 (https://download.01.org/0day-ci/archive/20241009/202410090402.lospEFvZ-lkp@xxxxxxxxx/config)
compiler: alpha-linux-gcc (GCC) 13.3.0
reproduce: (https://download.01.org/0day-ci/archive/20241009/202410090402.lospEFvZ-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202410090402.lospEFvZ-lkp@xxxxxxxxx/

sparse warnings: (new ones prefixed by >>)
>> drivers/misc/fastrpc.c:1696:19: sparse: sparse: incorrect type in assignment (different base types) @@     expected unsigned long long [usertype] args @@     got struct fastrpc_invoke_args *[assigned] args @@
   drivers/misc/fastrpc.c:1696:19: sparse:     expected unsigned long long [usertype] args
   drivers/misc/fastrpc.c:1696:19: sparse:     got struct fastrpc_invoke_args *[assigned] args
>> drivers/misc/fastrpc.c:1716:18: sparse: sparse: incorrect type in argument 1 (different base types) @@     expected void const *objp @@     got unsigned long long [addressable] [usertype] args @@
   drivers/misc/fastrpc.c:1716:18: sparse:     expected void const *objp
   drivers/misc/fastrpc.c:1716:18: sparse:     got unsigned long long [addressable] [usertype] args
   drivers/misc/fastrpc.c:1734:23: sparse: sparse: incorrect type in argument 1 (different base types) @@     expected void const *objp @@     got unsigned long long [addressable] [usertype] args @@
   drivers/misc/fastrpc.c:1734:23: sparse:     expected void const *objp
   drivers/misc/fastrpc.c:1734:23: sparse:     got unsigned long long [addressable] [usertype] args
   drivers/misc/fastrpc.c: note: in included file (through include/linux/swait.h, include/linux/completion.h):
   include/linux/list.h:83:21: sparse: sparse: self-comparison always evaluates to true
   include/linux/list.h:83:21: sparse: sparse: self-comparison always evaluates to true
   include/linux/list.h:83:21: sparse: sparse: self-comparison always evaluates to true
   include/linux/list.h:83:21: sparse: sparse: self-comparison always evaluates to true
   include/linux/list.h:83:21: sparse: sparse: self-comparison always evaluates to true
   include/linux/list.h:83:21: sparse: sparse: self-comparison always evaluates to true

vim +1696 drivers/misc/fastrpc.c

  1677	
  1678	static int fastrpc_copy_args(struct fastrpc_invoke *inv)
  1679	{
  1680		struct fastrpc_invoke_args *args = NULL;
  1681		u32 nscalars;
  1682	
  1683		/* nscalars is truncated here to max supported value */
  1684		nscalars = REMOTE_SCALARS_LENGTH(inv->sc);
  1685		if (nscalars) {
  1686			args = kcalloc(nscalars, sizeof(*args), GFP_KERNEL);
  1687			if (!args)
  1688				return -ENOMEM;
  1689	
  1690			if (copy_from_user(args, (void __user *)(uintptr_t)inv->args,
  1691					   nscalars * sizeof(*args))) {
  1692				kfree(args);
  1693				return -EFAULT;
  1694			}
  1695		}
> 1696		inv->args = args;
  1697	
  1698		return 0;
  1699	}
  1700	
  1701	static int fastrpc_invoke(struct fastrpc_user *fl, char __user *argp)
  1702	{
  1703		struct fastrpc_invoke_v2 ioctl = {0};
  1704		struct fastrpc_invoke inv;
  1705		int err;
  1706	
  1707		if (copy_from_user(&inv, argp, sizeof(inv)))
  1708			return -EFAULT;
  1709	
  1710		err = fastrpc_copy_args(&inv);
  1711		if (err)
  1712			return err;
  1713	
  1714		ioctl.inv = inv;
  1715		err = fastrpc_internal_invoke(fl, false, &ioctl);
> 1716		kfree(inv.args);
  1717	
  1718		return err;
  1719	}
  1720	

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