[drm-intel:drm-intel-next 14/14] drivers/gpu/drm/i915/display/intel_fb.c:1220:42: warning: Possible null pointer dereference: obj [nullPointer]

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

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CC: kbuild-all(a)lists.01.org
CC: intel-gfx(a)lists.freedesktop.org
CC: dri-devel(a)lists.freedesktop.org
TO: Jani Nikula <jani.nikula@intel.com>
CC: Rodrigo Vivi <rodrigo.vivi@intel.com>

tree:   git://anongit.freedesktop.org/drm-intel drm-intel-next
head:   705d4feeb269e22c4850ad66e2210b737b553236
commit: 705d4feeb269e22c4850ad66e2210b737b553236 [14/14] drm/i915/fb: move user framebuffer stuff to intel_fb.c
:::::: branch date: 2 weeks ago
:::::: commit date: 2 weeks ago
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>


cppcheck possible warnings: (new ones prefixed by >>, may not real problems)

>> drivers/gpu/drm/ttm/ttm_bo.c:556:35: warning: Uninitialized variable: evict_mem [uninitvar]
    ret = ttm_bo_handle_move_mem(bo, evict_mem, true, ctx, &hop);
                                     ^
--
>> drivers/gpu/drm/i915/display/intel_fb.c:1220:42: warning: Possible null pointer dereference: obj [nullPointer]
    struct drm_i915_private *i915 = to_i915(obj->base.dev);
                                            ^
   drivers/gpu/drm/i915/display/intel_fb.c:1219:36: note: Assignment 'obj=(fb)?to_intel_bo(fb->obj[0]):NULL', assigned value is 0
    struct drm_i915_gem_object *obj = intel_fb_obj(fb);
                                      ^
   drivers/gpu/drm/i915/display/intel_fb.c:1220:42: note: Null pointer dereference
    struct drm_i915_private *i915 = to_i915(obj->base.dev);
                                            ^

vim +1220 drivers/gpu/drm/i915/display/intel_fb.c

705d4feeb269e2 Jani Nikula 2021-08-23  1214  
705d4feeb269e2 Jani Nikula 2021-08-23  1215  static int intel_user_framebuffer_create_handle(struct drm_framebuffer *fb,
705d4feeb269e2 Jani Nikula 2021-08-23  1216  						struct drm_file *file,
705d4feeb269e2 Jani Nikula 2021-08-23  1217  						unsigned int *handle)
705d4feeb269e2 Jani Nikula 2021-08-23  1218  {
705d4feeb269e2 Jani Nikula 2021-08-23  1219  	struct drm_i915_gem_object *obj = intel_fb_obj(fb);
705d4feeb269e2 Jani Nikula 2021-08-23 @1220  	struct drm_i915_private *i915 = to_i915(obj->base.dev);
705d4feeb269e2 Jani Nikula 2021-08-23  1221  
705d4feeb269e2 Jani Nikula 2021-08-23  1222  	if (i915_gem_object_is_userptr(obj)) {
705d4feeb269e2 Jani Nikula 2021-08-23  1223  		drm_dbg(&i915->drm,
705d4feeb269e2 Jani Nikula 2021-08-23  1224  			"attempting to use a userptr for a framebuffer, denied\n");
705d4feeb269e2 Jani Nikula 2021-08-23  1225  		return -EINVAL;
705d4feeb269e2 Jani Nikula 2021-08-23  1226  	}
705d4feeb269e2 Jani Nikula 2021-08-23  1227  
705d4feeb269e2 Jani Nikula 2021-08-23  1228  	return drm_gem_handle_create(file, &obj->base, handle);
705d4feeb269e2 Jani Nikula 2021-08-23  1229  }
705d4feeb269e2 Jani Nikula 2021-08-23  1230  

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