[brauner-github:work.ovl.cred.guard 46/47] fs/overlayfs/util.c:70:9: sparse: sparse: cannot size expression

[brauner-github:work.ovl.cred.guard 46/47] fs/overlayfs/util.c:70:9: sparse: sparse: cannot size expression

[kernel test robot]

:::::: 
:::::: Manual check reason: "low confidence static check warning: fs/overlayfs/util.c:70:9: sparse: sparse: cannot size expression"
:::::: 

BCC: lkp@intel.com
CC: oe-kbuild-all@lists.linux.dev
CC: Christian Brauner <christianvanbrauner@gmail.com>
TO: Christian Brauner <brauner@kernel.org>

tree:   https://github.com/brauner/linux.git work.ovl.cred.guard
head:   74fa97e66e24a79a77ee469a7e8305f2013edd1f
commit: 05caf92703741e332e658d583bddc36d18d0067b [46/47] ovl: detect double credential overrides
:::::: branch date: 2 days ago
:::::: commit date: 2 days ago
config: x86_64-randconfig-r112-20251115 (https://download.01.org/0day-ci/archive/20251116/202511160131.7ekHOUWN-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251116/202511160131.7ekHOUWN-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/r/202511160131.7ekHOUWN-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
   fs/overlayfs/util.c:70:9: sparse: sparse: incompatible types in comparison expression (different address spaces):
   fs/overlayfs/util.c:70:9: sparse:    struct cred const [noderef] __rcu *
   fs/overlayfs/util.c:70:9: sparse:    struct cred const *
   fs/overlayfs/util.c:70:9: sparse: sparse: cast from unknown type
>> fs/overlayfs/util.c:70:9: sparse: sparse: cannot size expression

vim +70 fs/overlayfs/util.c

bbb1e54dd53cf8 Miklos Szeredi    2016-12-16  64  
bbb1e54dd53cf8 Miklos Szeredi    2016-12-16  65  const struct cred *ovl_override_creds(struct super_block *sb)
bbb1e54dd53cf8 Miklos Szeredi    2016-12-16  66  {
f01d08899fd7fa Andrea Righi      2023-05-21  67  	struct ovl_fs *ofs = OVL_FS(sb);
bbb1e54dd53cf8 Miklos Szeredi    2016-12-16  68  
05caf92703741e Christian Brauner 2025-11-13  69  	/* Detect callchains where we override credentials multiple times. */
05caf92703741e Christian Brauner 2025-11-13 @70  	VFS_WARN_ON_ONCE(current->cred == ofs->creator_cred);
6771e004b40962 Christian Brauner 2024-11-25  71  	return override_creds(ofs->creator_cred);
bbb1e54dd53cf8 Miklos Szeredi    2016-12-16  72  }
bbb1e54dd53cf8 Miklos Szeredi    2016-12-16  73  

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