[android-common:android13-5.10 1/1] drivers/android/binder.c:1373:70: sparse: sparse: Using plain integer as NULL pointer

[kernel test robot <lkp@intel.com>]

tree:   https://android.googlesource.com/kernel/common android13-5.10
head:   a0f93b828ee5433c5b427d8122a6dda0b514d985
commit: 35014985c266face161f6d107f8d8338e02a0b2d [1/1] ANDROID: vendor_hooks: Add hooks for binder proc transaction
config: arm64-randconfig-r122-20251224 (https://download.01.org/0day-ci/archive/20260104/202601040303.lt0kVb1G-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 12.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260104/202601040303.lt0kVb1G-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/202601040303.lt0kVb1G-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> drivers/android/binder.c:1373:70: sparse: sparse: Using plain integer as NULL pointer
   drivers/android/binder.c:2508:41: sparse: sparse: Using plain integer as NULL pointer
   drivers/android/binder.c:4580:24: sparse: sparse: incorrect type in return expression (different base types) @@     expected restricted __poll_t @@     got int @@
   drivers/android/binder.c:4580:24: sparse:     expected restricted __poll_t
   drivers/android/binder.c:4580:24: sparse:     got int

vim +1373 drivers/android/binder.c

  1363	
  1364	/**
  1365	 * binder_free_ref() - free the binder_ref
  1366	 * @ref:	ref to free
  1367	 *
  1368	 * Free the binder_ref. Free the binder_node indicated by ref->node
  1369	 * (if non-NULL) and the binder_ref_death indicated by ref->death.
  1370	 */
  1371	static void binder_free_ref(struct binder_ref *ref)
  1372	{
> 1373		trace_android_vh_binder_del_ref(ref->proc ? ref->proc->tsk : 0, ref->data.desc);
  1374		if (ref->node)
  1375			binder_free_node(ref->node);
  1376		kfree(ref->death);
  1377		kfree(ref);
  1378	}
  1379	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki