security/lsm_syscalls.c:31:1: 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:   075dbe9f6e3c21596c5245826a4ee1f1c1676eb8
commit: a04a1198088a1378d0389c250cc684f649bcc91e LSM: syscalls for current process attributes
date:   11 months ago
config: s390-randconfig-r132-20240927 (https://download.01.org/0day-ci/archive/20240927/202409272033.h0DMpeW3-lkp@xxxxxxxxx/config)
compiler: s390-linux-gcc (GCC) 14.1.0
reproduce: (https://download.01.org/0day-ci/archive/20240927/202409272033.h0DMpeW3-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/202409272033.h0DMpeW3-lkp@xxxxxxxxx/

sparse warnings: (new ones prefixed by >>)
>> security/lsm_syscalls.c:31:1: sparse: sparse: Using plain integer as NULL pointer
>> security/lsm_syscalls.c:31:1: sparse: sparse: Using plain integer as NULL pointer
   security/lsm_syscalls.c:53:1: sparse: sparse: Using plain integer as NULL pointer
   security/lsm_syscalls.c:53:1: sparse: sparse: Using plain integer as NULL pointer
   security/lsm_syscalls.c:53:1: sparse: sparse: Using plain integer as NULL pointer
   security/lsm_syscalls.c:53:1: sparse: sparse: Using plain integer as NULL pointer

vim +31 security/lsm_syscalls.c

    19	
    20	/**
    21	 * sys_lsm_set_self_attr - Set current task's security module attribute
    22	 * @attr: which attribute to set
    23	 * @ctx: the LSM contexts
    24	 * @size: size of @ctx
    25	 * @flags: reserved for future use
    26	 *
    27	 * Sets the calling task's LSM context. On success this function
    28	 * returns 0. If the attribute specified cannot be set a negative
    29	 * value indicating the reason for the error is returned.
    30	 */
  > 31	SYSCALL_DEFINE4(lsm_set_self_attr, unsigned int, attr, struct lsm_ctx __user *,
    32			ctx, size_t, size, u32, flags)
    33	{
    34		return security_setselfattr(attr, ctx, size, flags);
    35	}
    36	

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