mm/mempolicy.c:3719:1-6: ERROR: invalid free of structure field

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   7d4e49a77d9930c69751b9192448fda6ff9100f1
commit: e341f9c3c8412e57fe0042a33a2640245ecdf619 mm/mempolicy: Weighted Interleave Auto-tuning
date:   11 days ago
config: loongarch-randconfig-r054-20250601 (https://download.01.org/0day-ci/archive/20250601/202506011545.Fduxqxqj-lkp@intel.com/config)
compiler: loongarch64-linux-gcc (GCC) 15.1.0

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/202506011545.Fduxqxqj-lkp@intel.com/

cocci warnings: (new ones prefixed by >>)
>> mm/mempolicy.c:3719:1-6: ERROR: invalid free of structure field

vim +3719 mm/mempolicy.c

  3700	
  3701	static void wi_state_free(void)
  3702	{
  3703		struct weighted_interleave_state *old_wi_state;
  3704	
  3705		mutex_lock(&wi_state_lock);
  3706	
  3707		old_wi_state = rcu_dereference_protected(wi_state,
  3708				lockdep_is_held(&wi_state_lock));
  3709		if (!old_wi_state) {
  3710			mutex_unlock(&wi_state_lock);
  3711			goto out;
  3712		}
  3713	
  3714		rcu_assign_pointer(wi_state, NULL);
  3715		mutex_unlock(&wi_state_lock);
  3716		synchronize_rcu();
  3717		kfree(old_wi_state);
  3718	out:
> 3719		kfree(&wi_group->wi_kobj);
  3720	}
  3721	

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