:::::: :::::: Manual check reason: "low confidence bisect report" :::::: Manual check reason: "low confidence static check warning: fs/namespace.c:4039:12: warning: use of uninitialized value 'err' [CWE-457] [-Wanalyzer-use-of-uninitialized-value]" ::::::
BCC: l...@intel.com CC: kbuild-...@lists.01.org CC: linux-ker...@vger.kernel.org TO: Al Viro <v...@zeniv.linux.org.uk> tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 7e18e42e4b280c85b76967a9106a13ca61c16179 commit: e257039f0fc7da36ac3a522ef9a5cb4ae7852e67 mount_setattr(): clean the control flow and calling conventions date: 6 months ago :::::: branch date: 3 hours ago :::::: commit date: 6 months ago config: arm-randconfig-c002-20220904 (https://download.01.org/0day-ci/archive/20220905/202209050654.xcgcj51z-...@intel.com/config) compiler: arm-linux-gnueabi-gcc (GCC) 12.1.0 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=e257039f0fc7da36ac3a522ef9a5cb4ae7852e67 git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout e257039f0fc7da36ac3a522ef9a5cb4ae7852e67 # save the config file COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross ARCH=arm 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 >>) In function 'mount_setattr_prepare': cc1: warning: use of uninitialized value '<unknown>' [CWE-457] [-Wanalyzer-use-of-uninitialized-value] 'do_mount_setattr': events 1-4 | |fs/namespace.c:4099:12: | 4099 | static int do_mount_setattr(struct path *path, struct mount_kattr *kattr) | | ^~~~~~~~~~~~~~~~ | | | | | (1) entry to 'do_mount_setattr' |...... | 4104 | if (path->dentry != mnt->mnt.mnt_root) | | ~ | | | | | (2) following 'false' branch... |...... | 4107 | if (kattr->propagation) { | | ~~~~~~~~~~~~~~~~~~ | | | | | (3) ...to here |...... | 4126 | if (!is_mounted(&mnt->mnt)) | | ~ | | | | | (4) following 'true' branch... | 'do_mount_setattr': event 5 | |fs/mount.h:91:26: | 91 | return mnt != mnt->mnt_parent; | | ~~~^~~~~~~~~~~~ | | | | | (5) ...to here | 'do_mount_setattr': events 6-8 | |fs/namespace.c:4135:12: | 4135 | if (!(mnt_has_parent(mnt) ? check_mnt(mnt) : is_anon_ns(mnt->mnt_ns))) | | ^ | | | | | (6) following 'false' branch... |...... | 4143 | err = mount_setattr_prepare(kattr, mnt); | | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | | | | | (7) ...to here | | (8) calling 'mount_setattr_prepare' from 'do_mount_setattr' | +--> 'mount_setattr_prepare': events 9-11 | | 4014 | static int mount_setattr_prepare(struct mount_kattr *kattr, struct mount *mnt) | | ^~~~~~~~~~~~~~~~~~~~~ | | | | | (9) entry to 'mount_setattr_prepare' |...... | 4019 | for (m = mnt; m; m = next_mnt(m, mnt)) { | | ~ | | | | | (10) following 'false' branch (when 'm' is NULL)... |...... | 4039 | if (err) { | | ~ | | | | | (11) ...to here | 'mount_setattr_prepare': event 12 | |cc1: | (12): use of uninitialized value '[01m[K<unknown>[m[K' here | >> fs/namespace.c:4039:12: warning: use of uninitialized value 'err' [CWE-457] >> [-Wanalyzer-use-of-uninitialized-value] 4039 | if (err) { | ^ 'do_mount_setattr': events 1-4 | | 4099 | static int do_mount_setattr(struct path *path, struct mount_kattr *kattr) | | ^~~~~~~~~~~~~~~~ | | | | | (1) entry to 'do_mount_setattr' |...... | 4104 | if (path->dentry != mnt->mnt.mnt_root) | | ~ | | | | | (2) following 'false' branch... |...... | 4107 | if (kattr->propagation) { | | ~~~~~~~~~~~~~~~~~~ | | | | | (3) ...to here |...... | 4126 | if (!is_mounted(&mnt->mnt)) | | ~ | | | | | (4) following 'true' branch... | 'do_mount_setattr': event 5 | |fs/mount.h:91:26: | 91 | return mnt != mnt->mnt_parent; | | ~~~^~~~~~~~~~~~ | | | | | (5) ...to here | 'do_mount_setattr': events 6-8 | |fs/namespace.c:4135:12: | 4135 | if (!(mnt_has_parent(mnt) ? check_mnt(mnt) : is_anon_ns(mnt->mnt_ns))) | | ^ | | | | | (6) following 'false' branch... |...... | 4143 | err = mount_setattr_prepare(kattr, mnt); | | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | | | | | (7) ...to here | | (8) calling 'mount_setattr_prepare' from 'do_mount_setattr' | +--> 'mount_setattr_prepare': events 9-13 | | 4014 | static int mount_setattr_prepare(struct mount_kattr *kattr, struct mount *mnt) | | ^~~~~~~~~~~~~~~~~~~~~ | | | | | (9) entry to 'mount_setattr_prepare' |...... | 4017 | int err; | | ~~~ | | | | | (10) region created on stack here | 4018 | | 4019 | for (m = mnt; m; m = next_mnt(m, mnt)) { | | ~ | | | | | (11) following 'false' branch (when 'm' is NULL)... |...... | 4039 | if (err) { | | ~ | | | | | (12) ...to here | | (13) use of uninitialized value 'err' here | vim +/err +4039 fs/namespace.c a26f788b6e7a10 Christian Brauner 2022-02-03 4013 87bb5b60019c60 Christian Brauner 2022-02-03 4014 static int mount_setattr_prepare(struct mount_kattr *kattr, struct mount *mnt) 2a1867219c7b27 Christian Brauner 2021-01-21 4015 { e257039f0fc7da Al Viro 2022-02-28 4016 struct mount *m; e257039f0fc7da Al Viro 2022-02-28 4017 int err; 2a1867219c7b27 Christian Brauner 2021-01-21 4018 e257039f0fc7da Al Viro 2022-02-28 4019 for (m = mnt; m; m = next_mnt(m, mnt)) { e257039f0fc7da Al Viro 2022-02-28 4020 if (!can_change_locked_flags(m, recalc_flags(kattr, m))) { e257039f0fc7da Al Viro 2022-02-28 4021 err = -EPERM; e257039f0fc7da Al Viro 2022-02-28 4022 break; e257039f0fc7da Al Viro 2022-02-28 4023 } 9caccd41541a6f Christian Brauner 2021-01-21 4024 87bb5b60019c60 Christian Brauner 2022-02-03 4025 err = can_idmap_mount(kattr, m); 87bb5b60019c60 Christian Brauner 2022-02-03 4026 if (err) e257039f0fc7da Al Viro 2022-02-28 4027 break; a26f788b6e7a10 Christian Brauner 2022-02-03 4028 e257039f0fc7da Al Viro 2022-02-28 4029 if (!mnt_allow_writers(kattr, m)) { 87bb5b60019c60 Christian Brauner 2022-02-03 4030 err = mnt_hold_writers(m); 87bb5b60019c60 Christian Brauner 2022-02-03 4031 if (err) e257039f0fc7da Al Viro 2022-02-28 4032 break; e257039f0fc7da Al Viro 2022-02-28 4033 } 2a1867219c7b27 Christian Brauner 2021-01-21 4034 e257039f0fc7da Al Viro 2022-02-28 4035 if (!kattr->recurse) 87bb5b60019c60 Christian Brauner 2022-02-03 4036 return 0; 2a1867219c7b27 Christian Brauner 2021-01-21 4037 } 2a1867219c7b27 Christian Brauner 2021-01-21 4038 e257039f0fc7da Al Viro 2022-02-28 @4039 if (err) { e257039f0fc7da Al Viro 2022-02-28 4040 struct mount *p; e257039f0fc7da Al Viro 2022-02-28 4041 e257039f0fc7da Al Viro 2022-02-28 4042 for (p = mnt; p != m; p = next_mnt(p, mnt)) { e257039f0fc7da Al Viro 2022-02-28 4043 /* If we had to hold writers unblock them. */ e257039f0fc7da Al Viro 2022-02-28 4044 if (p->mnt.mnt_flags & MNT_WRITE_HOLD) e257039f0fc7da Al Viro 2022-02-28 4045 mnt_unhold_writers(p); e257039f0fc7da Al Viro 2022-02-28 4046 } e257039f0fc7da Al Viro 2022-02-28 4047 } e257039f0fc7da Al Viro 2022-02-28 4048 return err; e257039f0fc7da Al Viro 2022-02-28 4049 } e257039f0fc7da Al Viro 2022-02-28 4050 -- 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
