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Wed, 23 Sep 2026 01:37:33 -0700 (PDT) Date: Wed, 23 Sep 2026 11:37:30 +0300 From: Dan Carpenter To: oe-kbuild@lists.linux.dev, Jim Cromie , =?utf-8?Q?=C5=81ukasz?= Bartosik Cc: lkp@intel.com, oe-kbuild-all@lists.linux.dev Subject: [jimc:m10 35/44] lib/dynamic_debug.c:854 param_set_dyndbg_module_classes() error: we previously assumed 'map' could be null (see line 841) Message-ID: <202609230952.6jFrseQb-lkp@intel.com> Precedence: bulk X-Mailing-List: oe-kbuild-all@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline tree: https://github.com/jimc/linux.git m10 head: f95e4f1e4ce035c9b5f8da68c66d83f2452d92d5 commit: feb8ec0044ac67921562346a4a6b831204667ea9 [35/44] dyndbg: resolve "protection" of class'd pr_debug config: x86_64-randconfig-2200-20260923 (https://download.01.org/0day-ci/archive/20260923/202609230952.6jFrseQb-lkp@intel.com/config) compiler: gcc-14 (Debian 14.2.0-19) 14.2.0 smatch: v0.5.0-9187-g5189e3fb 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/202609230952.6jFrseQb-lkp@intel.com/ smatch warnings: lib/dynamic_debug.c:854 param_set_dyndbg_module_classes() error: we previously assumed 'map' could be null (see line 841) vim +/map +854 lib/dynamic_debug.c 7f10c4fc568572 Jim Cromie 2025-11-18 832 static int param_set_dyndbg_module_classes(const char *instr, 7f10c4fc568572 Jim Cromie 2025-11-18 833 const struct kernel_param *kp, 7f10c4fc568572 Jim Cromie 2025-11-18 834 const char *mod_name) b9400852c0801a Jim Cromie 2022-09-04 835 { feb8ec0044ac67 Jim Cromie 2025-11-18 836 struct ddebug_class_param *dcp = kp->arg; feb8ec0044ac67 Jim Cromie 2025-11-18 837 struct ddebug_class_map *map = dcp->map; 62b32b2a95ef1c Jim Cromie 2025-11-18 838 u32 inrep, new_bits, old_bits, old_val; b9400852c0801a Jim Cromie 2022-09-04 839 int rc, totct = 0; b9400852c0801a Jim Cromie 2022-09-04 840 feb8ec0044ac67 Jim Cromie 2025-11-18 @841 if (map && !map->controlling_param) ^^^ Can map really be NULL? feb8ec0044ac67 Jim Cromie 2025-11-18 842 map->controlling_param = dcp; feb8ec0044ac67 Jim Cromie 2025-11-18 843 62b32b2a95ef1c Jim Cromie 2025-11-18 844 rc = kstrtou32(instr, 0, &inrep); b9400852c0801a Jim Cromie 2022-09-04 845 if (rc) { cec8bafd130370 Jim Cromie 2025-11-18 846 int len = strcspn(instr, "\n"); cec8bafd130370 Jim Cromie 2025-11-18 847 cec8bafd130370 Jim Cromie 2025-11-18 848 pr_err("expecting numeric input, not: %.*s > %s\n", cec8bafd130370 Jim Cromie 2025-11-18 849 len, instr, KP_NAME(kp)); b9400852c0801a Jim Cromie 2022-09-04 850 return -EINVAL; b9400852c0801a Jim Cromie 2022-09-04 851 } d88925c4b39c80 Jim Cromie 2025-11-18 852 ddebug_class_param_clamp_input(&inrep, kp); 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a="108314228" X-IronPort-AV: E=Sophos;i="6.27,118,1787036400"; d="scan'208";a="108314228" Received: from fmviesa013.fm.intel.com ([10.60.135.153]) by fmvoesa102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 23 Sep 2026 00:29:21 -0700 X-CSE-ConnectionGUID: x852znemQhuOwFivwBlQCA== X-CSE-MsgGUID: 2EQi01ejRj6iHp5J5LHQGA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.27,118,1787036400"; d="scan'208";a="4778504" Received: from igk-lkp-server01.igk.intel.com (HELO 1bbc298b9a73) ([10.211.93.152]) by fmviesa013.fm.intel.com with ESMTP; 23 Sep 2026 00:29:19 -0700 Received: from kbuild by 1bbc298b9a73 with local (Exim 4.98.2) (envelope-from ) id 1x9HPo-000000000ZL-28Gk; Wed, 23 Sep 2026 07:29:16 +0000 Date: Wed, 23 Sep 2026 09:28:39 +0200 From: kernel test robot To: oe-kbuild@lists.linux.dev Cc: lkp@intel.com, Dan Carpenter Subject: [jimc:m10 35/44] lib/dynamic_debug.c:854 param_set_dyndbg_module_classes() error: we previously assumed 'map' could be null (see line 841) Message-ID: <202609230952.6jFrseQb-lkp@intel.com> User-Agent: s-nail v14.9.25 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=utf-8 Content-Transfer-Encoding: quoted-printable BCC: lkp@intel.com CC: oe-kbuild-all@lists.linux.dev TO: Jim Cromie TO: "=C5=81ukasz Bartosik" tree: https://github.com/jimc/linux.git m10 head: f95e4f1e4ce035c9b5f8da68c66d83f2452d92d5 commit: feb8ec0044ac67921562346a4a6b831204667ea9 [35/44] dyndbg: resolve "p= rotection" of class'd pr_debug :::::: branch date: 4 days ago :::::: commit date: 4 days ago config: x86_64-randconfig-2200-20260923 (https://download.01.org/0day-ci/ar= chive/20260923/202609230952.6jFrseQb-lkp@intel.com/config) compiler: gcc-14 (Debian 14.2.0-19) 14.2.0 smatch: v0.5.0-9187-g5189e3fb 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/202609230952.6jFrseQb-lkp@intel.com/ smatch warnings: lib/dynamic_debug.c:854 param_set_dyndbg_module_classes() error: we previou= sly assumed 'map' could be null (see line 841) vim +/map +854 lib/dynamic_debug.c d88925c4b39c80 Jim Cromie 2025-11-18 819 =20 d88925c4b39c80 Jim Cromie 2025-11-18 820 /** d88925c4b39c80 Jim Cromie 2025-11-18 821 * param_set_dyndbg_classes - cl= ass FOO >control d88925c4b39c80 Jim Cromie 2025-11-18 822 * @instr: string echo>d to sysf= s, input depends on map_type d88925c4b39c80 Jim Cromie 2025-11-18 823 * @kp: kp->arg has state: bi= ts/lvl, map, map_type d88925c4b39c80 Jim Cromie 2025-11-18 824 * @mod_name: module name or nul= l for all modules with the classes d88925c4b39c80 Jim Cromie 2025-11-18 825 * d88925c4b39c80 Jim Cromie 2025-11-18 826 * Enable/disable prdbgs by thei= r class, as given in the arguments to d88925c4b39c80 Jim Cromie 2025-11-18 827 * DECLARE_DYNDBG_CLASSMAP. For= LEVEL map-types, enforce relative d88925c4b39c80 Jim Cromie 2025-11-18 828 * levels by bitpos. d88925c4b39c80 Jim Cromie 2025-11-18 829 * d88925c4b39c80 Jim Cromie 2025-11-18 830 * Returns: 0 or <0 if error. b9400852c0801a Jim Cromie 2022-09-04 831 */ 7f10c4fc568572 Jim Cromie 2025-11-18 832 static int param_set_dyndbg_modu= le_classes(const char *instr, 7f10c4fc568572 Jim Cromie 2025-11-18 833 const struct kernel_para= m *kp, 7f10c4fc568572 Jim Cromie 2025-11-18 834 const char *mod_name) b9400852c0801a Jim Cromie 2022-09-04 835 { feb8ec0044ac67 Jim Cromie 2025-11-18 836 struct ddebug_class_param *dcp = =3D kp->arg; feb8ec0044ac67 Jim Cromie 2025-11-18 837 struct ddebug_class_map *map = =3D dcp->map; 62b32b2a95ef1c Jim Cromie 2025-11-18 838 u32 inrep, new_bits, old_bits, = old_val; b9400852c0801a Jim Cromie 2022-09-04 839 int rc, totct =3D 0; b9400852c0801a Jim Cromie 2022-09-04 840 =20 feb8ec0044ac67 Jim Cromie 2025-11-18 @841 if (map && !map->controlling_pa= ram) feb8ec0044ac67 Jim Cromie 2025-11-18 842 map->controlling_param =3D dcp; feb8ec0044ac67 Jim Cromie 2025-11-18 843 =20 62b32b2a95ef1c Jim Cromie 2025-11-18 844 rc =3D kstrtou32(instr, 0, &inr= ep); b9400852c0801a Jim Cromie 2022-09-04 845 if (rc) { cec8bafd130370 Jim Cromie 2025-11-18 846 int len =3D strcspn(instr, "\n= "); cec8bafd130370 Jim Cromie 2025-11-18 847 =20 cec8bafd130370 Jim Cromie 2025-11-18 848 pr_err("expecting numeric inpu= t, not: %.*s > %s\n", cec8bafd130370 Jim Cromie 2025-11-18 849 len, instr, KP_NAME(kp)= ); b9400852c0801a Jim Cromie 2022-09-04 850 return -EINVAL; b9400852c0801a Jim Cromie 2022-09-04 851 } d88925c4b39c80 Jim Cromie 2025-11-18 852 ddebug_class_param_clamp_input(= &inrep, kp); b9400852c0801a Jim Cromie 2022-09-04 853 =20 b9400852c0801a Jim Cromie 2022-09-04 @854 switch (map->map_type) { b9400852c0801a Jim Cromie 2022-09-04 855 case DD_CLASS_TYPE_DISJOINT_BIT= S: 7f10c4fc568572 Jim Cromie 2025-11-18 856 old_val =3D READ_ONCE(*dcp->bi= ts); 62b32b2a95ef1c Jim Cromie 2025-11-18 857 v2pr_info("bits:0x%x > %s.%s\n= ", inrep, mod_name ?: "*", KP_NAME(kp)); a62837264de615 Jim Cromie 2025-11-18 858 totct +=3D ddebug_apply_class_= bitmap(dcp, &inrep, old_val, mod_name); 7f10c4fc568572 Jim Cromie 2025-11-18 859 WRITE_ONCE(*dcp->bits, inrep); b9400852c0801a Jim Cromie 2022-09-04 860 break; b9400852c0801a Jim Cromie 2022-09-04 861 case DD_CLASS_TYPE_LEVEL_NUM: 7f10c4fc568572 Jim Cromie 2025-11-18 862 old_val =3D READ_ONCE(*dcp->lv= l); 7f10c4fc568572 Jim Cromie 2025-11-18 863 old_bits =3D CLASSMAP_BITMASK(= old_val); b9400852c0801a Jim Cromie 2022-09-04 864 new_bits =3D CLASSMAP_BITMASK(= inrep); 62b32b2a95ef1c Jim Cromie 2025-11-18 865 v2pr_info("lvl:%u bits:0x%x > = %s\n", inrep, new_bits, KP_NAME(kp)); a62837264de615 Jim Cromie 2025-11-18 866 totct +=3D ddebug_apply_class_= bitmap(dcp, &new_bits, old_bits, mod_name); 7f10c4fc568572 Jim Cromie 2025-11-18 867 WRITE_ONCE(*dcp->lvl, inrep); b9400852c0801a Jim Cromie 2022-09-04 868 break; b9400852c0801a Jim Cromie 2022-09-04 869 default: b9400852c0801a Jim Cromie 2022-09-04 870 pr_warn("%s: bad map type: %d\= n", KP_NAME(kp), map->map_type); cec8bafd130370 Jim Cromie 2025-11-18 871 return -EINVAL; b9400852c0801a Jim Cromie 2022-09-04 872 } b9400852c0801a Jim Cromie 2022-09-04 873 vpr_info("%s: total matches: %d= \n", KP_NAME(kp), totct); b9400852c0801a Jim Cromie 2022-09-04 874 return 0; b9400852c0801a Jim Cromie 2022-09-04 875 } 7f10c4fc568572 Jim Cromie 2025-11-18 876 =20 :::::: The code at line 854 was first introduced by commit :::::: b9400852c0801aebee4fc8b62e6b7cc69c7fcbda dyndbg: add drm.debug style= (drm/parameters/debug) bitmap support :::::: TO: Jim Cromie :::::: CC: Greg Kroah-Hartman -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki