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charset=utf-8 Content-Transfer-Encoding: quoted-printable BCC: lkp@intel.com CC: oe-kbuild-all@lists.linux.dev TO: Shenghao Yang CC: Ruben Wauters tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git= master head: b775e489bec70895b7ef6b66927886bbac79598f commit: dc2d5ddb193e363187bae2ad358245642d2721fb [5767/6121] drm/gud: fix N= ULL fb and crtc dereferences on USB disconnect :::::: branch date: 8 hours ago :::::: commit date: 23 hours ago config: x86_64-randconfig-161-20260114 (https://download.01.org/0day-ci/arc= hive/20260114/202601142159.0v8ilfVs-lkp@intel.com/config) compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f022= 7cb60147a26a1eeb4fb06e3b505e9c7261) rustc: rustc 1.88.0 (6b00bc388 2025-06-23) smatch version: v0.5.0-8985-g2614ff1a If you fix the issue in a separate patch/commit (i.e. not just a new versio= n of the same patch/commit), kindly add following tags | Reported-by: kernel test robot | Reported-by: Dan Carpenter | Closes: https://lore.kernel.org/r/202601142159.0v8ilfVs-lkp@intel.com/ smatch warnings: drivers/gpu/drm/gud/gud_pipe.c:616 gud_plane_atomic_update() error: we prev= iously assumed 'crtc' could be null (see line 597) vim +/crtc +616 drivers/gpu/drm/gud/gud_pipe.c 40e1a70b4aedf2 Noralf Tr=C3=B8nnes 2021-03-13 582 =20 73cfd166e04576 Ruben Wauters 2025-08-18 583 void gud_plane_atomic_update= (struct drm_plane *plane, 73cfd166e04576 Ruben Wauters 2025-08-18 584 struct drm_atomic_st= ate *atomic_state) 40e1a70b4aedf2 Noralf Tr=C3=B8nnes 2021-03-13 585 { 73cfd166e04576 Ruben Wauters 2025-08-18 586 struct drm_device *drm =3D = plane->dev; 40e1a70b4aedf2 Noralf Tr=C3=B8nnes 2021-03-13 587 struct gud_device *gdr= m =3D to_gud_device(drm); 73cfd166e04576 Ruben Wauters 2025-08-18 588 struct drm_plane_state *old= _state =3D drm_atomic_get_old_plane_state(atomic_state, plane); 73cfd166e04576 Ruben Wauters 2025-08-18 589 struct drm_plane_state *new= _state =3D drm_atomic_get_new_plane_state(atomic_state, plane); 73cfd166e04576 Ruben Wauters 2025-08-18 590 struct drm_shadow_plane_sta= te *shadow_plane_state =3D to_drm_shadow_plane_state(new_state); 73cfd166e04576 Ruben Wauters 2025-08-18 591 struct drm_framebuffer *fb = =3D new_state->fb; 73cfd166e04576 Ruben Wauters 2025-08-18 592 struct drm_crtc *crtc =3D n= ew_state->crtc; 40e1a70b4aedf2 Noralf Tr=C3=B8nnes 2021-03-13 593 struct drm_rect damage; 73cfd166e04576 Ruben Wauters 2025-08-18 594 struct drm_atomic_helper_da= mage_iter iter; c17d048609bf09 Noralf Tr=C3=B8nnes 2022-11-30 595 int ret, idx; 40e1a70b4aedf2 Noralf Tr=C3=B8nnes 2021-03-13 596 =20 dc2d5ddb193e36 Shenghao Yang 2025-12-31 @597 if (!crtc || crtc->state->m= ode_changed || !crtc->state->enable) { 40e1a70b4aedf2 Noralf Tr=C3=B8nnes 2021-03-13 598 cancel_work_sync(&gdr= m->work); 40e1a70b4aedf2 Noralf Tr=C3=B8nnes 2021-03-13 599 mutex_lock(&gdrm->dam= age_lock); 40e1a70b4aedf2 Noralf Tr=C3=B8nnes 2021-03-13 600 if (gdrm->fb) { 40e1a70b4aedf2 Noralf Tr=C3=B8nnes 2021-03-13 601 drm_framebuffer_put(= gdrm->fb); 40e1a70b4aedf2 Noralf Tr=C3=B8nnes 2021-03-13 602 gdrm->fb =3D NULL; 40e1a70b4aedf2 Noralf Tr=C3=B8nnes 2021-03-13 603 } 40e1a70b4aedf2 Noralf Tr=C3=B8nnes 2021-03-13 604 gud_clear_damage(gdrm= ); c17d048609bf09 Noralf Tr=C3=B8nnes 2022-11-30 605 vfree(gdrm->shadow_bu= f); c17d048609bf09 Noralf Tr=C3=B8nnes 2022-11-30 606 gdrm->shadow_buf =3D = NULL; 40e1a70b4aedf2 Noralf Tr=C3=B8nnes 2021-03-13 607 mutex_unlock(&gdrm->d= amage_lock); 40e1a70b4aedf2 Noralf Tr=C3=B8nnes 2021-03-13 608 } 40e1a70b4aedf2 Noralf Tr=C3=B8nnes 2021-03-13 609 =20 40e1a70b4aedf2 Noralf Tr=C3=B8nnes 2021-03-13 610 if (!drm_dev_enter(drm= , &idx)) 40e1a70b4aedf2 Noralf Tr=C3=B8nnes 2021-03-13 611 return; 40e1a70b4aedf2 Noralf Tr=C3=B8nnes 2021-03-13 612 =20 40e1a70b4aedf2 Noralf Tr=C3=B8nnes 2021-03-13 613 if (!old_state->fb) 40e1a70b4aedf2 Noralf Tr=C3=B8nnes 2021-03-13 614 gud_usb_set_u8(gdrm, = GUD_REQ_SET_CONTROLLER_ENABLE, 1); 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Sun, 18 Jan 2026 03:40:28 -0800 (PST) Received: from localhost ([196.207.164.177]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4801e8c0475sm167559335e9.10.2026.01.18.03.40.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 18 Jan 2026 03:40:27 -0800 (PST) Date: Sun, 18 Jan 2026 14:40:24 +0300 From: Dan Carpenter To: oe-kbuild@lists.linux.dev, Shenghao Yang Cc: lkp@intel.com, oe-kbuild-all@lists.linux.dev, Ruben Wauters Subject: [linux-next:master 5767/6121] drivers/gpu/drm/gud/gud_pipe.c:616 gud_plane_atomic_update() error: we previously assumed 'crtc' could be null (see line 597) Message-ID: <202601142159.0v8ilfVs-lkp@intel.com> Precedence: bulk X-Mailing-List: oe-kbuild@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit Message-ID: <20260118114024.84KmirvBL3PBVRSfoemh5cjr4jZvwsMkA579-eYdVB4@z> tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: b775e489bec70895b7ef6b66927886bbac79598f commit: dc2d5ddb193e363187bae2ad358245642d2721fb [5767/6121] drm/gud: fix NULL fb and crtc dereferences on USB disconnect config: x86_64-randconfig-161-20260114 (https://download.01.org/0day-ci/archive/20260114/202601142159.0v8ilfVs-lkp@intel.com/config) compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261) rustc: rustc 1.88.0 (6b00bc388 2025-06-23) smatch version: v0.5.0-8985-g2614ff1a 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 | Reported-by: Dan Carpenter | Closes: https://lore.kernel.org/r/202601142159.0v8ilfVs-lkp@intel.com/ smatch warnings: drivers/gpu/drm/gud/gud_pipe.c:616 gud_plane_atomic_update() error: we previously assumed 'crtc' could be null (see line 597) vim +/crtc +616 drivers/gpu/drm/gud/gud_pipe.c 73cfd166e04576 Ruben Wauters 2025-08-18 583 void gud_plane_atomic_update(struct drm_plane *plane, 73cfd166e04576 Ruben Wauters 2025-08-18 584 struct drm_atomic_state *atomic_state) 40e1a70b4aedf2 Noralf Trønnes 2021-03-13 585 { 73cfd166e04576 Ruben Wauters 2025-08-18 586 struct drm_device *drm = plane->dev; 40e1a70b4aedf2 Noralf Trønnes 2021-03-13 587 struct gud_device *gdrm = to_gud_device(drm); 73cfd166e04576 Ruben Wauters 2025-08-18 588 struct drm_plane_state *old_state = drm_atomic_get_old_plane_state(atomic_state, plane); 73cfd166e04576 Ruben Wauters 2025-08-18 589 struct drm_plane_state *new_state = drm_atomic_get_new_plane_state(atomic_state, plane); 73cfd166e04576 Ruben Wauters 2025-08-18 590 struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(new_state); 73cfd166e04576 Ruben Wauters 2025-08-18 591 struct drm_framebuffer *fb = new_state->fb; 73cfd166e04576 Ruben Wauters 2025-08-18 592 struct drm_crtc *crtc = new_state->crtc; 40e1a70b4aedf2 Noralf Trønnes 2021-03-13 593 struct drm_rect damage; 73cfd166e04576 Ruben Wauters 2025-08-18 594 struct drm_atomic_helper_damage_iter iter; c17d048609bf09 Noralf Trønnes 2022-11-30 595 int ret, idx; 40e1a70b4aedf2 Noralf Trønnes 2021-03-13 596 dc2d5ddb193e36 Shenghao Yang 2025-12-31 @597 if (!crtc || crtc->state->mode_changed || !crtc->state->enable) { ^^^^ Check for NULL 40e1a70b4aedf2 Noralf Trønnes 2021-03-13 598 cancel_work_sync(&gdrm->work); 40e1a70b4aedf2 Noralf Trønnes 2021-03-13 599 mutex_lock(&gdrm->damage_lock); 40e1a70b4aedf2 Noralf Trønnes 2021-03-13 600 if (gdrm->fb) { 40e1a70b4aedf2 Noralf Trønnes 2021-03-13 601 drm_framebuffer_put(gdrm->fb); 40e1a70b4aedf2 Noralf Trønnes 2021-03-13 602 gdrm->fb = NULL; 40e1a70b4aedf2 Noralf Trønnes 2021-03-13 603 } 40e1a70b4aedf2 Noralf Trønnes 2021-03-13 604 gud_clear_damage(gdrm); c17d048609bf09 Noralf Trønnes 2022-11-30 605 vfree(gdrm->shadow_buf); c17d048609bf09 Noralf Trønnes 2022-11-30 606 gdrm->shadow_buf = NULL; 40e1a70b4aedf2 Noralf Trønnes 2021-03-13 607 mutex_unlock(&gdrm->damage_lock); 40e1a70b4aedf2 Noralf Trønnes 2021-03-13 608 } 40e1a70b4aedf2 Noralf Trønnes 2021-03-13 609 40e1a70b4aedf2 Noralf Trønnes 2021-03-13 610 if (!drm_dev_enter(drm, &idx)) 40e1a70b4aedf2 Noralf Trønnes 2021-03-13 611 return; 40e1a70b4aedf2 Noralf Trønnes 2021-03-13 612 40e1a70b4aedf2 Noralf Trønnes 2021-03-13 613 if (!old_state->fb) 40e1a70b4aedf2 Noralf Trønnes 2021-03-13 614 gud_usb_set_u8(gdrm, GUD_REQ_SET_CONTROLLER_ENABLE, 1); 40e1a70b4aedf2 Noralf Trønnes 2021-03-13 615 40e1a70b4aedf2 Noralf Trønnes 2021-03-13 @616 if (fb && (crtc->state->mode_changed || crtc->state->connectors_changed)) ^^^^ ^^^^ Unchecked dereferences. -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki