Re: [PATCH v10 2/9] overflow: Move and add few utility macros into overflow

[kernel test robot]

Hi Gwan-gyeong,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on drm-tip/drm-tip]
[also build test WARNING on linus/master v6.0-rc5]
[cannot apply to drm-intel/for-linux-next kees/for-next/hardening next-20220916]
[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/Gwan-gyeong-Mun/Fixes-integer-overflow-or-integer-truncation-issues-in-page-lookups-ttm-place-configuration-and-scatterlist-creation/20220909-190301
base:   git://anongit.freedesktop.org/drm/drm-tip drm-tip
config: i386-randconfig-s002 (https://download.01.org/0day-ci/archive/20220918/202209180742.kE2Xbxqz-lkp@xxxxxxxxx/config)
compiler: gcc-11 (Debian 11.3.0-5) 11.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.4-39-gce1a6720-dirty
        # https://github.com/intel-lab-lkp/linux/commit/8d39d691758034d1082773e43b9cb4738b1f4387
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Gwan-gyeong-Mun/Fixes-integer-overflow-or-integer-truncation-issues-in-page-lookups-ttm-place-configuration-and-scatterlist-creation/20220909-190301
        git checkout 8d39d691758034d1082773e43b9cb4738b1f4387
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=i386 SHELL=/bin/bash drivers/gpu/drm/i915/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@xxxxxxxxx>

sparse warnings: (new ones prefixed by >>)
>> drivers/gpu/drm/i915/i915_user_extensions.c:56:21: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected struct i915_user_extension [noderef] __user *ext @@     got void *[noderef] __user @@
   drivers/gpu/drm/i915/i915_user_extensions.c:56:21: sparse:     expected struct i915_user_extension [noderef] __user *ext
   drivers/gpu/drm/i915/i915_user_extensions.c:56:21: sparse:     got void *[noderef] __user

vim +56 drivers/gpu/drm/i915/i915_user_extensions.c

    15	
    16	int i915_user_extensions(struct i915_user_extension __user *ext,
    17				 const i915_user_extension_fn *tbl,
    18				 unsigned int count,
    19				 void *data)
    20	{
    21		unsigned int stackdepth = 512;
    22	
    23		while (ext) {
    24			int i, err;
    25			u32 name;
    26			u64 next;
    27	
    28			if (!stackdepth--) /* recursion vs useful flexibility */
    29				return -E2BIG;
    30	
    31			err = check_user_mbz(&ext->flags);
    32			if (err)
    33				return err;
    34	
    35			for (i = 0; i < ARRAY_SIZE(ext->rsvd); i++) {
    36				err = check_user_mbz(&ext->rsvd[i]);
    37				if (err)
    38					return err;
    39			}
    40	
    41			if (get_user(name, &ext->name))
    42				return -EFAULT;
    43	
    44			err = -EINVAL;
    45			if (name < count) {
    46				name = array_index_nospec(name, count);
    47				if (tbl[name])
    48					err = tbl[name](ext, data);
    49			}
    50			if (err)
    51				return err;
    52	
    53			if (get_user(next, &ext->next_extension))
    54				return -EFAULT;
    55	
  > 56			if (check_assign_user_ptr(next, ext))

-- 
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