[kbuild-all] [cifs:for-next 4/15] fs/cifs/cifsacl.c:914:42: warning: variable 'nmode' is uninitialized when used here

tree: git://git.samba.org/sfrench/cifs-2.6.git for-next head: 8f79025175de6bc8cac5c7aa4ea3763e92270058 commit: 253374f7557e41729abf380c127f57627e0d4f9c [4/15] cifs: Fix unix perm bits to cifsacl conversion for "other" bits. config: x86_64-randconfig-r032-20201209 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 1968804ac726e7674d5de22bc2204b45857da344) 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 # install x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu git remote add cifs git://git.samba.org/sfrench/cifs-2.6.git git fetch --no-tags cifs for-next git checkout 253374f7557e41729abf380c127f57627e0d4f9c # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): size += setup_special_mode_ACE(pntace, nmode); ^~~~~ fs/cifs/cifsacl.c:901:13: note: initialize the variable 'nmode' to silence this warning __u64 nmode; ^ = 0 1 warning generated. vim +/nmode +914 fs/cifs/cifsacl.c 975221eca5fbfd Steve French 2020-06-12 894 97837582bc1e19 Steve French 2007-12-31 895 static int set_chmod_dacl(struct cifs_acl *pndacl, struct cifs_sid *pownersid, 253374f7557e41 Shyam Prasad N 2020-08-17 896 struct cifs_sid *pgrpsid, __u64 *pnmode, bool modefromsid) 97837582bc1e19 Steve French 2007-12-31 897 { 2b210adcb08c79 Al Viro 2008-03-29 898 u16 size = 0; e37a02c7ebb9fa Aurelien Aptel 2019-09-17 899 u32 num_aces = 0; 97837582bc1e19 Steve French 2007-12-31 900 struct cifs_acl *pnndacl; 253374f7557e41 Shyam Prasad N 2020-08-17 901 __u64 nmode; 253374f7557e41 Shyam Prasad N 2020-08-17 902 __u64 user_mode; 253374f7557e41 Shyam Prasad N 2020-08-17 903 __u64 group_mode; 253374f7557e41 Shyam Prasad N 2020-08-17 904 __u64 other_mode; 253374f7557e41 Shyam Prasad N 2020-08-17 905 __u64 deny_user_mode = 0; 253374f7557e41 Shyam Prasad N 2020-08-17 906 __u64 deny_group_mode = 0; 97837582bc1e19 Steve French 2007-12-31 907 97837582bc1e19 Steve French 2007-12-31 908 pnndacl = (struct cifs_acl *)((char *)pndacl + sizeof(struct cifs_acl)); 97837582bc1e19 Steve French 2007-12-31 909 22442179a5bb8c Steve French 2019-07-19 910 if (modefromsid) { 22442179a5bb8c Steve French 2019-07-19 911 struct cifs_ace *pntace = 22442179a5bb8c Steve French 2019-07-19 912 (struct cifs_ace *)((char *)pnndacl + size); 22442179a5bb8c Steve French 2019-07-19 913 fdef665ba44ad5 Steve French 2019-12-06 @914 size += setup_special_mode_ACE(pntace, nmode); e37a02c7ebb9fa Aurelien Aptel 2019-09-17 915 num_aces++; 253374f7557e41 Shyam Prasad N 2020-08-17 916 goto set_size; e37a02c7ebb9fa Aurelien Aptel 2019-09-17 917 } e37a02c7ebb9fa Aurelien Aptel 2019-09-17 918 253374f7557e41 Shyam Prasad N 2020-08-17 919 /* 253374f7557e41 Shyam Prasad N 2020-08-17 920 * We'll try to keep the mode as requested by the user. 253374f7557e41 Shyam Prasad N 2020-08-17 921 * But in cases where we cannot meaningfully convert that 253374f7557e41 Shyam Prasad N 2020-08-17 922 * into ACL, return back the updated mode, so that it is 253374f7557e41 Shyam Prasad N 2020-08-17 923 * updated in the inode. 253374f7557e41 Shyam Prasad N 2020-08-17 924 */ 253374f7557e41 Shyam Prasad N 2020-08-17 925 nmode = *pnmode; 253374f7557e41 Shyam Prasad N 2020-08-17 926 253374f7557e41 Shyam Prasad N 2020-08-17 927 if (!memcmp(pownersid, pgrpsid, sizeof(struct cifs_sid))) { 253374f7557e41 Shyam Prasad N 2020-08-17 928 /* 253374f7557e41 Shyam Prasad N 2020-08-17 929 * Case when owner and group SIDs are the same. 253374f7557e41 Shyam Prasad N 2020-08-17 930 * Set the more restrictive of the two modes. 253374f7557e41 Shyam Prasad N 2020-08-17 931 */ 253374f7557e41 Shyam Prasad N 2020-08-17 932 user_mode = nmode & (nmode << 3) & 0700; 253374f7557e41 Shyam Prasad N 2020-08-17 933 group_mode = nmode & (nmode >> 3) & 0070; 253374f7557e41 Shyam Prasad N 2020-08-17 934 } else { 253374f7557e41 Shyam Prasad N 2020-08-17 935 user_mode = nmode & 0700; 253374f7557e41 Shyam Prasad N 2020-08-17 936 group_mode = nmode & 0070; 253374f7557e41 Shyam Prasad N 2020-08-17 937 } 253374f7557e41 Shyam Prasad N 2020-08-17 938 253374f7557e41 Shyam Prasad N 2020-08-17 939 other_mode = nmode & 0007; 253374f7557e41 Shyam Prasad N 2020-08-17 940 253374f7557e41 Shyam Prasad N 2020-08-17 941 /* We need DENY ACE when the perm is more restrictive than the next sets. */ 253374f7557e41 Shyam Prasad N 2020-08-17 942 deny_user_mode = ~(user_mode) & ((group_mode << 3) | (other_mode << 6)) & 0700; 253374f7557e41 Shyam Prasad N 2020-08-17 943 deny_group_mode = ~(group_mode) & (other_mode << 3) & 0070; 253374f7557e41 Shyam Prasad N 2020-08-17 944 253374f7557e41 Shyam Prasad N 2020-08-17 945 *pnmode = user_mode | group_mode | other_mode | (nmode & ~0777); 253374f7557e41 Shyam Prasad N 2020-08-17 946 253374f7557e41 Shyam Prasad N 2020-08-17 947 if (deny_user_mode) { 22442179a5bb8c Steve French 2019-07-19 948 size += fill_ace_for_sid((struct cifs_ace *)((char *)pnndacl + size), 253374f7557e41 Shyam Prasad N 2020-08-17 949 pownersid, deny_user_mode, 0700, ACCESS_DENIED); e37a02c7ebb9fa Aurelien Aptel 2019-09-17 950 num_aces++; 253374f7557e41 Shyam Prasad N 2020-08-17 951 } 253374f7557e41 Shyam Prasad N 2020-08-17 952 /* Group DENY ACE does not conflict with owner ALLOW ACE. Keep in preferred order*/ 253374f7557e41 Shyam Prasad N 2020-08-17 953 if (deny_group_mode && !(deny_group_mode & (user_mode >> 3))) { 253374f7557e41 Shyam Prasad N 2020-08-17 954 size += fill_ace_for_sid((struct cifs_ace *)((char *)pnndacl + size), 253374f7557e41 Shyam Prasad N 2020-08-17 955 pgrpsid, deny_group_mode, 0070, ACCESS_DENIED); 253374f7557e41 Shyam Prasad N 2020-08-17 956 num_aces++; 253374f7557e41 Shyam Prasad N 2020-08-17 957 } 253374f7557e41 Shyam Prasad N 2020-08-17 958 size += fill_ace_for_sid((struct cifs_ace *) ((char *)pnndacl + size), 253374f7557e41 Shyam Prasad N 2020-08-17 959 pownersid, user_mode, 0700, ACCESS_ALLOWED); 253374f7557e41 Shyam Prasad N 2020-08-17 960 num_aces++; 253374f7557e41 Shyam Prasad N 2020-08-17 961 /* Group DENY ACE conflicts with owner ALLOW ACE. So keep it after. */ 253374f7557e41 Shyam Prasad N 2020-08-17 962 if (deny_group_mode && (deny_group_mode & (user_mode >> 3))) { 253374f7557e41 Shyam Prasad N 2020-08-17 963 size += fill_ace_for_sid((struct cifs_ace *)((char *)pnndacl + size), 253374f7557e41 Shyam Prasad N 2020-08-17 964 pgrpsid, deny_group_mode, 0070, ACCESS_DENIED); 253374f7557e41 Shyam Prasad N 2020-08-17 965 num_aces++; 253374f7557e41 Shyam Prasad N 2020-08-17 966 } e37a02c7ebb9fa Aurelien Aptel 2019-09-17 967 size += fill_ace_for_sid((struct cifs_ace *)((char *)pnndacl + size), 253374f7557e41 Shyam Prasad N 2020-08-17 968 pgrpsid, group_mode, 0070, ACCESS_ALLOWED); e37a02c7ebb9fa Aurelien Aptel 2019-09-17 969 num_aces++; e37a02c7ebb9fa Aurelien Aptel 2019-09-17 970 size += fill_ace_for_sid((struct cifs_ace *)((char *)pnndacl + size), 253374f7557e41 Shyam Prasad N 2020-08-17 971 &sid_everyone, other_mode, 0007, ACCESS_ALLOWED); e37a02c7ebb9fa Aurelien Aptel 2019-09-17 972 num_aces++; 97837582bc1e19 Steve French 2007-12-31 973 253374f7557e41 Shyam Prasad N 2020-08-17 974 set_size: e37a02c7ebb9fa Aurelien Aptel 2019-09-17 975 pndacl->num_aces = cpu_to_le32(num_aces); 22442179a5bb8c Steve French 2019-07-19 976 pndacl->size = cpu_to_le16(size + sizeof(struct cifs_acl)); 22442179a5bb8c Steve French 2019-07-19 977 ef571cadd516e7 Shirish Pargaonkar 2008-07-24 978 return 0; 97837582bc1e19 Steve French 2007-12-31 979 } 97837582bc1e19 Steve French 2007-12-31 980 :::::: The code at line 914 was first introduced by commit :::::: fdef665ba44ad5ed154af2acfb19ae2ee3bf5dcc smb3: fix mode passed in on create for modetosid mount option :::::: TO: Steve French <stfrench(a)microsoft.com&gt; :::::: CC: Steve French <stfrench(a)microsoft.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org