[PATCH 3/8] drm/panthor: Fix UAF in panthor_gem_create_with_handle() debugfs code

[kernel test robot]

Hi Simona,

kernel test robot noticed the following build errors:

[auto build test ERROR on next-20250527]
[also build test ERROR on linus/master]
[cannot apply to v6.15 v6.15-rc7 v6.15-rc6 v6.15]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Simona-Vetter/drm-gem-Fix-race-in-drm_gem_handle_create_tail/20250528-171524
base:   next-20250527
patch link:    https://lore.kernel.org/r/20250528091307.1894940-4-simona.vetter%40ffwll.ch
patch subject: [PATCH 3/8] drm/panthor: Fix UAF in panthor_gem_create_with_handle() debugfs code
config: sparc-randconfig-r132-20250529 (https://download.01.org/0day-ci/archive/20250529/202505292016.42gSDa4w-lkp@intel.com/config)
compiler: sparc64-linux-gcc (GCC) 8.5.0
reproduce: (https://download.01.org/0day-ci/archive/20250529/202505292016.42gSDa4w-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 at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202505292016.42gSDa4w-lkp@intel.com/

All errors (new ones prefixed by >>):

   drivers/gpu/drm/panthor/panthor_gem.c: In function 'panthor_gem_create_object':
>> drivers/gpu/drm/panthor/panthor_gem.c:249:21: error: 'struct panthor_gem_object' has no member named 'debugfs'
     INIT_LIST_HEAD(&obj->debugfs.node);
                        ^~


vim +249 drivers/gpu/drm/panthor/panthor_gem.c

   225	
   226	/**
   227	 * panthor_gem_create_object - Implementation of driver->gem_create_object.
   228	 * @ddev: DRM device
   229	 * @size: Size in bytes of the memory the object will reference
   230	 *
   231	 * This lets the GEM helpers allocate object structs for us, and keep
   232	 * our BO stats correct.
   233	 */
   234	struct drm_gem_object *panthor_gem_create_object(struct drm_device *ddev, size_t size)
   235	{
   236		struct panthor_device *ptdev = container_of(ddev, struct panthor_device, base);
   237		struct panthor_gem_object *obj;
   238	
   239		obj = kzalloc(sizeof(*obj), GFP_KERNEL);
   240		if (!obj)
   241			return ERR_PTR(-ENOMEM);
   242	
   243		obj->base.base.funcs = &panthor_gem_funcs;
   244		obj->base.map_wc = !ptdev->coherent;
   245		mutex_init(&obj->gpuva_list_lock);
   246		drm_gem_gpuva_set_lock(&obj->base.base, &obj->gpuva_list_lock);
   247		mutex_init(&obj->label.lock);
   248	
 > 249		INIT_LIST_HEAD(&obj->debugfs.node);
   250	
   251		return &obj->base.base;
   252	}
   253	

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