* [linux-next:master 8227/9575] fs/libfs.c:2018:13: sparse: sparse: Using plain integer as NULL pointer
@ 2024-02-26 5:10 kernel test robot
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From: kernel test robot @ 2024-02-26 5:10 UTC (permalink / raw)
To: Christian Brauner; +Cc: oe-kbuild-all, Linux Memory Management List
tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head: 33e1d31873f87d119e5120b88cd350efa68ef276
commit: 6cac4ea940896aa83f82e01fa22965f51a6158bc [8227/9575] libfs: add path_from_stashed()
config: hexagon-randconfig-r113-20240226 (https://download.01.org/0day-ci/archive/20240226/202402261334.nvl11hSF-lkp@intel.com/config)
compiler: clang version 19.0.0git (https://github.com/llvm/llvm-project edd4aee4dd9b5b98b2576a6f783e4086173d902a)
reproduce: (https://download.01.org/0day-ci/archive/20240226/202402261334.nvl11hSF-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/202402261334.nvl11hSF-lkp@intel.com/
sparse warnings: (new ones prefixed by >>)
>> fs/libfs.c:2018:13: sparse: sparse: Using plain integer as NULL pointer
fs/libfs.c:2049:5: sparse: sparse: context imbalance in 'path_from_stashed' - wrong count at exit
vim +2018 fs/libfs.c
1989
1990 static struct dentry *stash_dentry(struct dentry **stashed, unsigned long ino,
1991 struct super_block *sb,
1992 const struct file_operations *fops,
1993 void *data)
1994 {
1995 struct dentry *dentry;
1996 struct inode *inode;
1997
1998 dentry = d_alloc_anon(sb);
1999 if (!dentry)
2000 return ERR_PTR(-ENOMEM);
2001
2002 inode = new_inode_pseudo(sb);
2003 if (!inode) {
2004 dput(dentry);
2005 return ERR_PTR(-ENOMEM);
2006 }
2007
2008 inode->i_ino = ino;
2009 inode->i_flags |= S_IMMUTABLE;
2010 inode->i_mode = S_IFREG | S_IRUGO;
2011 inode->i_fop = fops;
2012 inode->i_private = data;
2013 simple_inode_init_ts(inode);
2014
2015 /* @data is now owned by the fs */
2016 d_instantiate(dentry, inode);
2017
> 2018 if (cmpxchg(stashed, NULL, dentry)) {
2019 d_delete(dentry); /* make sure ->d_prune() does nothing */
2020 dput(dentry);
2021 cpu_relax();
2022 return ERR_PTR(-EAGAIN);
2023 }
2024
2025 return dentry;
2026 }
2027
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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