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 errors:

[auto build test ERROR on char-misc/char-misc-testing]
[also build test ERROR on char-misc/char-misc-next char-misc/char-misc-linus linus/master v6.12-rc2 next-20241004]
[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: loongarch-allmodconfig (https://download.01.org/0day-ci/archive/20241008/202410081016.Nuyub4XK-lkp@xxxxxxxxx/config)
compiler: loongarch64-linux-gcc (GCC) 14.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241008/202410081016.Nuyub4XK-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/202410081016.Nuyub4XK-lkp@xxxxxxxxx/

All errors (new ones prefixed by >>):

   drivers/misc/fastrpc.c: In function 'fastrpc_copy_args':
>> drivers/misc/fastrpc.c:1696:19: error: assignment to '__u64' {aka 'long long unsigned int'} from 'struct fastrpc_invoke_args *' makes integer from pointer without a cast [-Wint-conversion]
    1696 |         inv->args = args;
         |                   ^
   drivers/misc/fastrpc.c: In function 'fastrpc_invoke':
>> drivers/misc/fastrpc.c:1716:18: error: passing argument 1 of 'kfree' makes pointer from integer without a cast [-Wint-conversion]
    1716 |         kfree(inv.args);
         |               ~~~^~~~~
         |                  |
         |                  __u64 {aka long long unsigned int}
   In file included from include/linux/fs.h:45,
                    from arch/loongarch/include/asm/elf.h:9,
                    from include/linux/elf.h:6,
                    from include/linux/module.h:19,
                    from include/linux/device/driver.h:21,
                    from include/linux/device.h:32,
                    from drivers/misc/fastrpc.c:6:
   include/linux/slab.h:446:24: note: expected 'const void *' but argument is of type '__u64' {aka 'long long unsigned int'}
     446 | void kfree(const void *objp);
         |            ~~~~~~~~~~~~^~~~
   drivers/misc/fastrpc.c: In function 'fastrpc_invokev2':
   drivers/misc/fastrpc.c:1734:23: error: passing argument 1 of 'kfree' makes pointer from integer without a cast [-Wint-conversion]
    1734 |         kfree(inv2.inv.args);
         |               ~~~~~~~~^~~~~
         |                       |
         |                       __u64 {aka long long unsigned int}
   include/linux/slab.h:446:24: note: expected 'const void *' but argument is of type '__u64' {aka 'long long unsigned int'}
     446 | void kfree(const void *objp);
         |            ~~~~~~~~~~~~^~~~


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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