linux-kernel - [norov:gup 45/48] include/linux/bitmap.h:259:9: warning: 'memcpy' forming offset [20, 23] is out of the bounds [0, 20]

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Date:   Sat, 23 Apr 2022 08:44:04 +0800
From:   kernel test robot <lkp@...el.com>
To:     Yury Norov <yury.norov@...il.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: [norov:gup 45/48] include/linux/bitmap.h:259:9: warning: 'memcpy'
 forming offset [20, 23] is out of the bounds [0, 20]

tree:   https://github.com/norov/linux gup
head:   c96226d23c745b114dc041e0d8d0c272b280c71a
commit: f1cbd19c47bf73d532ff30571601c7ede57d5f82 [45/48] lib: add bitmap_{from,to}_arr64
config: csky-randconfig-r021-20220422 (https://download.01.org/0day-ci/archive/20220423/202204230819.d6pbriaa-lkp@intel.com/config)
compiler: csky-linux-gcc (GCC) 11.2.0
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://github.com/norov/linux/commit/f1cbd19c47bf73d532ff30571601c7ede57d5f82
        git remote add norov https://github.com/norov/linux
        git fetch --no-tags norov gup
        git checkout f1cbd19c47bf73d532ff30571601c7ede57d5f82
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross W=1 O=build_dir ARCH=csky SHELL=/bin/bash net/bluetooth/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

   In file included from include/linux/cpumask.h:12,
                    from include/linux/smp.h:13,
                    from include/linux/lockdep.h:14,
                    from include/linux/mutex.h:17,
                    from include/linux/rfkill.h:35,
                    from net/bluetooth/hci_core.c:29:
   In function 'bitmap_copy',
       inlined from 'bitmap_copy_clear_tail' at include/linux/bitmap.h:268:2,
       inlined from 'bitmap_from_u64' at include/linux/bitmap.h:622:2,
       inlined from 'hci_bdaddr_list_add_with_flags' at net/bluetooth/hci_core.c:2156:2:
>> include/linux/bitmap.h:259:9: warning: 'memcpy' forming offset [20, 23] is out of the bounds [0, 20] [-Warray-bounds]
     259 |         memcpy(dst, src, len);
         |         ^~~~~~~~~~~~~~~~~~~~~


vim +/memcpy +259 include/linux/bitmap.h

^1da177e4c3f41 Linus Torvalds   2005-04-16  254  
^1da177e4c3f41 Linus Torvalds   2005-04-16  255  static inline void bitmap_copy(unsigned long *dst, const unsigned long *src,
8b4daad52fee77 Rasmus Villemoes 2015-02-12  256  			unsigned int nbits)
^1da177e4c3f41 Linus Torvalds   2005-04-16  257  {
8b4daad52fee77 Rasmus Villemoes 2015-02-12  258  	unsigned int len = BITS_TO_LONGS(nbits) * sizeof(unsigned long);
^1da177e4c3f41 Linus Torvalds   2005-04-16 @259  	memcpy(dst, src, len);
^1da177e4c3f41 Linus Torvalds   2005-04-16  260  }
^1da177e4c3f41 Linus Torvalds   2005-04-16  261  

:::::: The code at line 259 was first introduced by commit
:::::: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Linux-2.6.12-rc2

:::::: TO: Linus Torvalds <torvalds@...970.osdl.org>
:::::: CC: Linus Torvalds <torvalds@...970.osdl.org>

-- 
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https://01.org/lkp