Re: [PATCH] fs: introduce getfsxattrat and setfsxattrat syscalls

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

Hi Andrey,

kernel test robot noticed the following build warnings:

[auto build test WARNING on brauner-vfs/vfs.all]
[also build test WARNING on geert-m68k/for-next powerpc/next powerpc/fixes s390/features linus/master v6.13-rc6 next-20250110]
[cannot apply to geert-m68k/for-linus deller-parisc/for-next jcmvbkbc-xtensa/xtensa-for-next arnd-asm-generic/master tip/x86/asm]
[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/Andrey-Albershteyn/fs-introduce-getfsxattrat-and-setfsxattrat-syscalls/20250110-014739
base:   https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git vfs.all
patch link:    https://lore.kernel.org/r/20250109174540.893098-1-aalbersh%40kernel.org
patch subject: [PATCH] fs: introduce getfsxattrat and setfsxattrat syscalls
config: m68k-randconfig-r122-20250111 (https://download.01.org/0day-ci/archive/20250113/202501131033.KKMmoHBV-lkp@intel.com/config)
compiler: m68k-linux-gcc (GCC) 14.2.0
reproduce: (https://download.01.org/0day-ci/archive/20250113/202501131033.KKMmoHBV-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/202501131033.KKMmoHBV-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
   fs/inode.c:957:24: sparse: sparse: context imbalance in 'inode_lru_isolate' - wrong count at exit
   fs/inode.c:1058:9: sparse: sparse: context imbalance in 'find_inode' - different lock contexts for basic block
   fs/inode.c:1099:9: sparse: sparse: context imbalance in 'find_inode_fast' - different lock contexts for basic block
   fs/inode.c:1829:5: sparse: sparse: context imbalance in 'insert_inode_locked' - wrong count at exit
   fs/inode.c:1947:20: sparse: sparse: context imbalance in 'iput_final' - unexpected unlock
   fs/inode.c:1961:6: sparse: sparse: context imbalance in 'iput' - wrong count at exit
   fs/inode.c:2494:17: sparse: sparse: context imbalance in '__wait_on_freeing_inode' - unexpected unlock
>> fs/inode.c:2998:39: sparse: sparse: incorrect type in argument 2 (different address spaces) @@     expected struct fsxattr [noderef] __user *ufa @@     got struct fsxattr *fsx @@
   fs/inode.c:2998:39: sparse:     expected struct fsxattr [noderef] __user *ufa
   fs/inode.c:2998:39: sparse:     got struct fsxattr *fsx
   fs/inode.c:3032:41: sparse: sparse: incorrect type in argument 2 (different address spaces) @@     expected struct fsxattr [noderef] __user *ufa @@     got struct fsxattr *fsx @@
   fs/inode.c:3032:41: sparse:     expected struct fsxattr [noderef] __user *ufa
   fs/inode.c:3032:41: sparse:     got struct fsxattr *fsx

vim +2998 fs/inode.c

  2959	
  2960	SYSCALL_DEFINE4(getfsxattrat, int, dfd, const char __user *, filename,
  2961			struct fsxattr *, fsx, int, at_flags)
  2962	{
  2963		struct fd dir;
  2964		struct fileattr fa;
  2965		struct path filepath;
  2966		struct inode *inode;
  2967		int error;
  2968	
  2969		if (at_flags)
  2970			return -EINVAL;
  2971	
  2972		if (!capable(CAP_FOWNER))
  2973			return -EPERM;
  2974	
  2975		dir = fdget(dfd);
  2976		if (!fd_file(dir))
  2977			return -EBADF;
  2978	
  2979		if (!S_ISDIR(file_inode(fd_file(dir))->i_mode)) {
  2980			error = -EBADF;
  2981			goto out;
  2982		}
  2983	
  2984		error = user_path_at(dfd, filename, at_flags, &filepath);
  2985		if (error)
  2986			goto out;
  2987	
  2988		inode = filepath.dentry->d_inode;
  2989		if (file_inode(fd_file(dir))->i_sb->s_magic != inode->i_sb->s_magic) {
  2990			error = -EBADF;
  2991			goto out_path;
  2992		}
  2993	
  2994		error = vfs_fileattr_get(filepath.dentry, &fa);
  2995		if (error)
  2996			goto out_path;
  2997	
> 2998		if (copy_fsxattr_to_user(&fa, fsx))
  2999			error = -EFAULT;
  3000	
  3001	out_path:
  3002		path_put(&filepath);
  3003	out:
  3004		fdput(dir);
  3005		return error;
  3006	}
  3007	

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