tree: https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git queue-4.4 head: 6a08a9e7fb1525fa296d810d200954f6c18d07a2 commit: d9c7067ceb34ec223012997c1d57f3919528b7ae [13/14] squashfs: add more sanity checks in xattr id lookup config: mips-allyesconfig (attached as .config) compiler: mips-linux-gcc (GCC) 7.5.0 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/sashal/linux-stable.git/c... git remote add sashal-linux-stable https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git git fetch --no-tags sashal-linux-stable queue-4.4 git checkout d9c7067ceb34ec223012997c1d57f3919528b7ae # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-7.5.0 make.cross ARCH=mips 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 >>): In file included from fs/squashfs/xattr_id.c:33:0: fs/squashfs/squashfs_fs.h: In function 'squashfs_block_size': fs/squashfs/squashfs_fs.h:135:29: warning: signed and unsigned type in conditional expression [-Wsign-compare] return (size >> 25) ? -EIO : size; ^ fs/squashfs/xattr_id.c: In function 'squashfs_xattr_lookup': if (index >= msblk->xattr_ids) ^~ fs/squashfs/xattr_id.c: In function 'squashfs_read_xattr_id_table': fs/squashfs/xattr_id.c:121:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (n = 0; n < (indexes - 1); n++) { ^ vim +51 fs/squashfs/xattr_id.c 37 38 /* 39 * Map xattr id using the xattr id look up table 40 */ 41 int squashfs_xattr_lookup(struct super_block *sb, unsigned int index, 42 int *count, unsigned int *size, unsigned long long *xattr) 43 { 44 struct squashfs_sb_info *msblk = sb->s_fs_info; 45 int block = SQUASHFS_XATTR_BLOCK(index); 46 int offset = SQUASHFS_XATTR_BLOCK_OFFSET(index); 47 u64 start_block; 48 struct squashfs_xattr_id id; 49 int err; 50 52 return -EINVAL; 53 54 start_block = le64_to_cpu(msblk->xattr_id_table[block]); 55 56 err = squashfs_read_metadata(sb, &id, &start_block, &offset, 57 sizeof(id)); 58 if (err < 0) 59 return err; 60 61 *xattr = le64_to_cpu(id.xattr); 62 *size = le32_to_cpu(id.size); 63 *count = le32_to_cpu(id.count); 64 return 0; 65 } 66 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org