security/landlock/syscalls.c:150:1: sparse: sparse: Using plain integer as NULL pointer

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   f2e8a57ee9036c7d5443382b6c3c09b51a92ec7e
commit: 265885daf3e5082eb9f6e2a23bdbf9ba4456a21b landlock: Add syscall implementations
date:   2 years, 8 months ago
config: s390-randconfig-r113-20231115 (https://download.01.org/0day-ci/archive/20231210/202312100424.bPSZJTIw-lkp@xxxxxxxxx/config)
compiler: s390-linux-gcc (GCC) 13.2.0
reproduce: (https://download.01.org/0day-ci/archive/20231210/202312100424.bPSZJTIw-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/202312100424.bPSZJTIw-lkp@xxxxxxxxx/

sparse warnings: (new ones prefixed by >>)
>> security/landlock/syscalls.c:150:1: sparse: sparse: Using plain integer as NULL pointer
>> security/landlock/syscalls.c:150:1: sparse: sparse: Using plain integer as NULL pointer
   security/landlock/syscalls.c:295:1: sparse: sparse: Using plain integer as NULL pointer
   security/landlock/syscalls.c:295:1: sparse: sparse: Using plain integer as NULL pointer

vim +150 security/landlock/syscalls.c

   130	
   131	/**
   132	 * sys_landlock_create_ruleset - Create a new ruleset
   133	 *
   134	 * @attr: Pointer to a &struct landlock_ruleset_attr identifying the scope of
   135	 *        the new ruleset.
   136	 * @size: Size of the pointed &struct landlock_ruleset_attr (needed for
   137	 *        backward and forward compatibility).
   138	 * @flags: Must be 0.
   139	 *
   140	 * This system call enables to create a new Landlock ruleset, and returns the
   141	 * related file descriptor on success.
   142	 *
   143	 * Possible returned errors are:
   144	 *
   145	 * - EOPNOTSUPP: Landlock is supported by the kernel but disabled at boot time;
   146	 * - EINVAL: @flags is not 0, or unknown access, or too small @size;
   147	 * - E2BIG or EFAULT: @attr or @size inconsistencies;
   148	 * - ENOMSG: empty &landlock_ruleset_attr.handled_access_fs.
   149	 */
 > 150	SYSCALL_DEFINE3(landlock_create_ruleset,
   151			const struct landlock_ruleset_attr __user *const, attr,
   152			const size_t, size, const __u32, flags)
   153	{
   154		struct landlock_ruleset_attr ruleset_attr;
   155		struct landlock_ruleset *ruleset;
   156		int err, ruleset_fd;
   157	
   158		/* Build-time checks. */
   159		build_check_abi();
   160	
   161		if (!landlock_initialized)
   162			return -EOPNOTSUPP;
   163	
   164		/* No flag for now. */
   165		if (flags)
   166			return -EINVAL;
   167	
   168		/* Copies raw user space buffer. */
   169		err = copy_min_struct_from_user(&ruleset_attr, sizeof(ruleset_attr),
   170				offsetofend(typeof(ruleset_attr), handled_access_fs),
   171				attr, size);
   172		if (err)
   173			return err;
   174	
   175		/* Checks content (and 32-bits cast). */
   176		if ((ruleset_attr.handled_access_fs | LANDLOCK_MASK_ACCESS_FS) !=
   177				LANDLOCK_MASK_ACCESS_FS)
   178			return -EINVAL;
   179	
   180		/* Checks arguments and transforms to kernel struct. */
   181		ruleset = landlock_create_ruleset(ruleset_attr.handled_access_fs);
   182		if (IS_ERR(ruleset))
   183			return PTR_ERR(ruleset);
   184	
   185		/* Creates anonymous FD referring to the ruleset. */
   186		ruleset_fd = anon_inode_getfd("landlock-ruleset", &ruleset_fops,
   187				ruleset, O_RDWR | O_CLOEXEC);
   188		if (ruleset_fd < 0)
   189			landlock_put_ruleset(ruleset);
   190		return ruleset_fd;
   191	}
   192	

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