Hi Jani, url: https://github.com/0day-ci/linux/commits/Jani-Nikula/drm-i915-refactor-intel-display/20201216-194754 base: git://anongit.freedesktop.org/drm-intel for-linux-next config: x86_64-randconfig-m001-20201216 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx> smatch warnings: drivers/gpu/drm/i915/display/intel_gen9_plane.c:712 skl_update_scaler_plane() error: we previously assumed 'fb' could be null (see line 696) vim +/fb +712 drivers/gpu/drm/i915/display/intel_gen9_plane.c 44f5af76b2fd05e Dave Airlie 2020-12-16 672 int skl_update_scaler_plane(struct intel_crtc_state *crtc_state, 44f5af76b2fd05e Dave Airlie 2020-12-16 673 struct intel_plane_state *plane_state) 44f5af76b2fd05e Dave Airlie 2020-12-16 674 { 44f5af76b2fd05e Dave Airlie 2020-12-16 675 struct intel_plane *intel_plane = 44f5af76b2fd05e Dave Airlie 2020-12-16 676 to_intel_plane(plane_state->uapi.plane); 44f5af76b2fd05e Dave Airlie 2020-12-16 677 struct drm_i915_private *dev_priv = to_i915(intel_plane->base.dev); 44f5af76b2fd05e Dave Airlie 2020-12-16 678 struct drm_framebuffer *fb = plane_state->hw.fb; 44f5af76b2fd05e Dave Airlie 2020-12-16 679 int ret; 44f5af76b2fd05e Dave Airlie 2020-12-16 680 bool force_detach = !fb || !plane_state->uapi.visible; 44f5af76b2fd05e Dave Airlie 2020-12-16 681 bool need_scaler = false; 44f5af76b2fd05e Dave Airlie 2020-12-16 682 44f5af76b2fd05e Dave Airlie 2020-12-16 683 /* Pre-gen11 and SDR planes always need a scaler for planar formats. */ 44f5af76b2fd05e Dave Airlie 2020-12-16 684 if (!icl_is_hdr_plane(dev_priv, intel_plane->id) && 44f5af76b2fd05e Dave Airlie 2020-12-16 685 fb && intel_format_info_is_yuv_semiplanar(fb->format, fb->modifier)) 44f5af76b2fd05e Dave Airlie 2020-12-16 686 need_scaler = true; 44f5af76b2fd05e Dave Airlie 2020-12-16 687 44f5af76b2fd05e Dave Airlie 2020-12-16 688 ret = skl_update_scaler(crtc_state, force_detach, 44f5af76b2fd05e Dave Airlie 2020-12-16 689 drm_plane_index(&intel_plane->base), 44f5af76b2fd05e Dave Airlie 2020-12-16 690 &plane_state->scaler_id, 44f5af76b2fd05e Dave Airlie 2020-12-16 691 drm_rect_width(&plane_state->uapi.src) >> 16, 44f5af76b2fd05e Dave Airlie 2020-12-16 692 drm_rect_height(&plane_state->uapi.src) >> 16, 44f5af76b2fd05e Dave Airlie 2020-12-16 693 drm_rect_width(&plane_state->uapi.dst), 44f5af76b2fd05e Dave Airlie 2020-12-16 694 drm_rect_height(&plane_state->uapi.dst), 44f5af76b2fd05e Dave Airlie 2020-12-16 695 fb ? fb->format : NULL, 44f5af76b2fd05e Dave Airlie 2020-12-16 @696 fb ? fb->modifier : 0, ^^^^^^^^^^^^^^^^^ This code and all previous code assumes that "fb" can be NULL. 44f5af76b2fd05e Dave Airlie 2020-12-16 697 need_scaler); 44f5af76b2fd05e Dave Airlie 2020-12-16 698 44f5af76b2fd05e Dave Airlie 2020-12-16 699 if (ret || plane_state->scaler_id < 0) ^^^^^^^^^^^^^^^^^^^^^^^^^^ Is this an error path? Should we set "ret = -EINVAL;" for this? 44f5af76b2fd05e Dave Airlie 2020-12-16 700 return ret; 44f5af76b2fd05e Dave Airlie 2020-12-16 701 44f5af76b2fd05e Dave Airlie 2020-12-16 702 /* check colorkey */ 44f5af76b2fd05e Dave Airlie 2020-12-16 703 if (plane_state->ckey.flags) { 44f5af76b2fd05e Dave Airlie 2020-12-16 704 drm_dbg_kms(&dev_priv->drm, 44f5af76b2fd05e Dave Airlie 2020-12-16 705 "[PLANE:%d:%s] scaling with color key not allowed", 44f5af76b2fd05e Dave Airlie 2020-12-16 706 intel_plane->base.base.id, 44f5af76b2fd05e Dave Airlie 2020-12-16 707 intel_plane->base.name); 44f5af76b2fd05e Dave Airlie 2020-12-16 708 return -EINVAL; 44f5af76b2fd05e Dave Airlie 2020-12-16 709 } 44f5af76b2fd05e Dave Airlie 2020-12-16 710 44f5af76b2fd05e Dave Airlie 2020-12-16 711 /* Check src format */ 44f5af76b2fd05e Dave Airlie 2020-12-16 @712 switch (fb->format->format) { ^^^^^^^^^^ Unchecked dereference. 44f5af76b2fd05e Dave Airlie 2020-12-16 713 case DRM_FORMAT_RGB565: 44f5af76b2fd05e Dave Airlie 2020-12-16 714 case DRM_FORMAT_XBGR8888: 44f5af76b2fd05e Dave Airlie 2020-12-16 715 case DRM_FORMAT_XRGB8888: 44f5af76b2fd05e Dave Airlie 2020-12-16 716 case DRM_FORMAT_ABGR8888: 44f5af76b2fd05e Dave Airlie 2020-12-16 717 case DRM_FORMAT_ARGB8888: 44f5af76b2fd05e Dave Airlie 2020-12-16 718 case DRM_FORMAT_XRGB2101010: --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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