:::::: :::::: Manual check reason: "low confidence bisect report" :::::: Manual check reason: "low confidence static check warning: drivers/gpu/drm/i915/display/intel_panel.c:159:46: warning: dereference of NULL 'preferred_mode' [CWE-476] [-Wanalyzer-null-dereference]" ::::::
CC: kbuild-...@lists.01.org BCC: l...@intel.com CC: linux-ker...@vger.kernel.org TO: "Ville Syrjälä" <ville.syrj...@linux.intel.com> CC: Jani Nikula <jani.nik...@intel.com> tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 4b35035bcf80ddb47c0112c4fbd84a63a2836a18 commit: c19909d037b640a5e3580c68f420e7ba058c68e4 drm/i915: Allow higher refresh rate alternate fixed modes date: 3 months ago :::::: branch date: 27 hours ago :::::: commit date: 3 months ago config: x86_64-randconfig-c001-20220613 (https://download.01.org/0day-ci/archive/20220619/202206190758.rdyuewoz-...@intel.com/config) compiler: gcc-11 (Debian 11.3.0-3) 11.3.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c19909d037b640a5e3580c68f420e7ba058c68e4 git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout c19909d037b640a5e3580c68f420e7ba058c68e4 # save the config file ARCH=x86_64 KBUILD_USERCFLAGS='-fanalyzer -Wno-error' If you fix the issue, kindly add following tag where applicable Reported-by: kernel test robot <l...@intel.com> gcc-analyzer warnings: (new ones prefixed by >>) drivers/gpu/drm/i915/display/intel_panel.c: In function 'is_alt_fixed_mode': >> drivers/gpu/drm/i915/display/intel_panel.c:159:46: warning: dereference of >> NULL 'preferred_mode' [CWE-476] [-Wanalyzer-null-dereference] 159 | mode->clock != preferred_mode->clock; | ~~~~~~~~~~~~~~^~~~~~~ 'intel_panel_add_edid_alt_fixed_modes': event 1 | | 162 | static void intel_panel_add_edid_alt_fixed_modes(struct intel_connector *connector) | | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | | | | | (1) entry to 'intel_panel_add_edid_alt_fixed_modes' | 'intel_panel_add_edid_alt_fixed_modes': event 2 | |include/linux/list.h:555:59: | 555 | pos__ != head__ ? list_entry(pos__, type, member) : NULL; \ drivers/gpu/drm/i915/display/intel_panel.c:52:16: note: in expansion of macro 'list_first_entry_or_null' | 52 | return list_first_entry_or_null(&connector->panel.fixed_modes, | | ^~~~~~~~~~~~~~~~~~~~~~~~ | 'intel_panel_add_edid_alt_fixed_modes': event 3 | |cc1: | (3): ...to here | 'intel_panel_add_edid_alt_fixed_modes': event 4 | |include/linux/list.h:727:14: | 727 | !list_entry_is_head(pos, head, member); \ | | ^ | | | | | (4) following 'true' branch... drivers/gpu/drm/i915/display/intel_panel.c:169:9: note: in expansion of macro 'list_for_each_entry_safe' | 169 | list_for_each_entry_safe(mode, next, &connector->base.probed_modes, head) { | | ^~~~~~~~~~~~~~~~~~~~~~~~ | 'intel_panel_add_edid_alt_fixed_modes': events 5-6 | | 170 | if (!is_alt_fixed_mode(mode, preferred_mode)) | | ^~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | | | | | | | (6) calling 'is_alt_fixed_mode' from 'intel_panel_add_edid_alt_fixed_modes' | | (5) ...to here | +--> 'is_alt_fixed_mode': events 7-10 | | 152 | static bool is_alt_fixed_mode(const struct drm_display_mode *mode, | | ^~~~~~~~~~~~~~~~~ | | | | | (7) entry to 'is_alt_fixed_mode' |...... | 155 | return drm_mode_match(mode, preferred_mode, | | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | 156 | DRM_MODE_MATCH_TIMINGS | | | ~~~~~~~~~~~~~~~~~~~~~~~~ | 157 | DRM_MODE_MATCH_FLAGS | | | ~~~~~~~~~~~~~~~~~~~~~~ | 158 | DRM_MODE_MATCH_3D_FLAGS) && | | ~~~~~~~~~~~~~~~~~~~~~~~~~~~ | | | | | (8) following 'true' branch... | 159 | mode->clock != preferred_mode->clock; | | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | | | | | | (9) ...to here (10) dereference of NULL 'preferred_mode' | vim +/preferred_mode +159 drivers/gpu/drm/i915/display/intel_panel.c 1d8e1c75ffa844 drivers/gpu/drm/i915/intel_panel.c Chris Wilson 2010-08-07 151 c19909d037b640 drivers/gpu/drm/i915/display/intel_panel.c Ville Syrjälä 2022-03-31 152 static bool is_alt_fixed_mode(const struct drm_display_mode *mode, c19909d037b640 drivers/gpu/drm/i915/display/intel_panel.c Ville Syrjälä 2022-03-31 153 const struct drm_display_mode *preferred_mode) 9f6fbe22be90b7 drivers/gpu/drm/i915/intel_panel.c Ville Syrjälä 2019-03-21 154 { c19909d037b640 drivers/gpu/drm/i915/display/intel_panel.c Ville Syrjälä 2022-03-31 155 return drm_mode_match(mode, preferred_mode, 9f6fbe22be90b7 drivers/gpu/drm/i915/intel_panel.c Ville Syrjälä 2019-03-21 156 DRM_MODE_MATCH_TIMINGS | 9f6fbe22be90b7 drivers/gpu/drm/i915/intel_panel.c Ville Syrjälä 2019-03-21 157 DRM_MODE_MATCH_FLAGS | 9f6fbe22be90b7 drivers/gpu/drm/i915/intel_panel.c Ville Syrjälä 2019-03-21 158 DRM_MODE_MATCH_3D_FLAGS) && c19909d037b640 drivers/gpu/drm/i915/display/intel_panel.c Ville Syrjälä 2022-03-31 @159 mode->clock != preferred_mode->clock; 9f6fbe22be90b7 drivers/gpu/drm/i915/intel_panel.c Ville Syrjälä 2019-03-21 160 } 9f6fbe22be90b7 drivers/gpu/drm/i915/intel_panel.c Ville Syrjälä 2019-03-21 161 -- 0-DAY CI Kernel Test Service https://01.org/lkp _______________________________________________ kbuild mailing list -- kbuild@lists.01.org To unsubscribe send an email to kbuild-le...@lists.01.org
