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

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Date:   Wed, 12 Oct 2022 23:00:46 +0800
From:   kernel test robot <lkp@...el.com>
To:     Mickaël Salaün <mic@...ux.microsoft.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        James Morris <jamorris@...ux.microsoft.com>
Subject: security/landlock/syscalls.c:150:1: sparse: sparse: Using plain
 integer as NULL pointer

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   49da070062390094112b423ba443ea193527b2e4
commit: 265885daf3e5082eb9f6e2a23bdbf9ba4456a21b landlock: Add syscall implementations
date:   1 year, 6 months ago
config: s390-randconfig-s052-20221012
compiler: s390-linux-gcc (GCC) 12.1.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.4-39-gce1a6720-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=265885daf3e5082eb9f6e2a23bdbf9ba4456a21b
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 265885daf3e5082eb9f6e2a23bdbf9ba4456a21b
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=s390 SHELL=/bin/bash

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

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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