[bug report] drm/amd/display: Do cursor programming with rest of pipe

[Dan Carpenter]

Hello Harry Wentland,

Commit 66eba12a5482 ("drm/amd/display: Do cursor programming with
rest of pipe") from Mar 15, 2024 (linux-next), leads to the following
Smatch static checker warning:

	drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c:8433 amdgpu_dm_update_cursor()
	error: we previously assumed 'afb' could be null (see line 8388)

drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c
    8379 static void amdgpu_dm_update_cursor(struct drm_plane *plane,
    8380                                     struct drm_plane_state *old_plane_state,
    8381                                     struct dc_stream_update *update)
    8382 {
    8383         struct amdgpu_device *adev = drm_to_adev(plane->dev);
    8384         struct amdgpu_framebuffer *afb = to_amdgpu_framebuffer(plane->state->fb);
    8385         struct drm_crtc *crtc = afb ? plane->state->crtc : old_plane_state->crtc;
                                         ^^^^^

    8386         struct dm_crtc_state *crtc_state = crtc ? to_dm_crtc_state(crtc->state) : NULL;
    8387         struct amdgpu_crtc *amdgpu_crtc = to_amdgpu_crtc(crtc);
    8388         uint64_t address = afb ? afb->address : 0;
                                    ^^^^^
Checks for NULL

    8389         struct dc_cursor_position position = {0};
    8390         struct dc_cursor_attributes attributes;
    8391         int ret;
    8392 
    8393         if (!plane->state->fb && !old_plane_state->fb)
    8394                 return;
    8395 
    8396         drm_dbg_atomic(plane->dev, "crtc_id=%d with size %d to %d\n",
    8397                        amdgpu_crtc->crtc_id, plane->state->crtc_w,
    8398                        plane->state->crtc_h);
    8399 
    8400         ret = amdgpu_dm_plane_get_cursor_position(plane, crtc, &position);
    8401         if (ret)
    8402                 return;
    8403 
    8404         if (!position.enable) {
    8405                 /* turn off cursor */
    8406                 if (crtc_state && crtc_state->stream) {
    8407                         dc_stream_set_cursor_position(crtc_state->stream,
    8408                                                       &position);
    8409                         update->cursor_position = &crtc_state->stream->cursor_position;
    8410                 }
    8411                 return;
    8412         }
    8413 
    8414         amdgpu_crtc->cursor_width = plane->state->crtc_w;
    8415         amdgpu_crtc->cursor_height = plane->state->crtc_h;
    8416 
    8417         memset(&attributes, 0, sizeof(attributes));
    8418         attributes.address.high_part = upper_32_bits(address);
    8419         attributes.address.low_part  = lower_32_bits(address);
    8420         attributes.width             = plane->state->crtc_w;
    8421         attributes.height            = plane->state->crtc_h;
    8422         attributes.color_format      = CURSOR_MODE_COLOR_PRE_MULTIPLIED_ALPHA;
    8423         attributes.rotation_angle    = 0;
    8424         attributes.attribute_flags.value = 0;
    8425 
    8426         /* Enable cursor degamma ROM on DCN3+ for implicit sRGB degamma in DRM
    8427          * legacy gamma setup.
    8428          */
    8429         if (crtc_state->cm_is_degamma_srgb &&
    8430             adev->dm.dc->caps.color.dpp.gamma_corr)
    8431                 attributes.attribute_flags.bits.ENABLE_CURSOR_DEGAMMA = 1;
    8432 
--> 8433         attributes.pitch = afb->base.pitches[0] / afb->base.format->cpp[0];
                                    ^^^^^                  ^^^^^
Unchecked dereferences

    8434 
    8435         if (crtc_state->stream) {
    8436                 if (!dc_stream_set_cursor_attributes(crtc_state->stream,
    8437                                                      &attributes))
    8438                         DRM_ERROR("DC failed to set cursor attributes\n");
    8439 
    8440                 update->cursor_attributes = &crtc_state->stream->cursor_attributes;
    8441 
    8442                 if (!dc_stream_set_cursor_position(crtc_state->stream,
    8443                                                    &position))
    8444                         DRM_ERROR("DC failed to set cursor position\n");
    8445 
    8446                 update->cursor_position = &crtc_state->stream->cursor_position;
    8447         }
    8448 }

regards,
dan carpenter