Hello Thomas Zimmermann,
Commit e45f72b6782f ("drm/sysfb: Add custom plane state") from Sep
18, 2025 (linux-next), leads to the following Smatch static checker
warning:
drivers/gpu/drm/sysfb/drm_sysfb_modeset.c:434 drm_sysfb_plane_reset()
error: NULL dereference inside function __drm_gem_reset_shadow_plane()
drivers/gpu/drm/sysfb/drm_sysfb_modeset.c
424 {
425 struct drm_sysfb_plane_state *sysfb_plane_state;
426
427 if (plane->state)
428
drm_sysfb_plane_state_destroy(to_drm_sysfb_plane_state(plane->state));
429
430 sysfb_plane_state = kzalloc(sizeof(*sysfb_plane_state),
GFP_KERNEL);
431 if (sysfb_plane_state)
432 __drm_gem_reset_shadow_plane(plane,
&sysfb_plane_state->base);
433 else
--> 434 __drm_gem_reset_shadow_plane(plane, NULL);
^^^^
Passing a NULL here will crash. (It's the second line where we call
drm_format_conv_state_init() that's the problem).
435 }
regards,
dan carpenter
