Re: [PATCH] Bluetooth: L2CAP: Fix l2cap_global_chan_by_psm regression

[kernel test robot <lkp@intel.com>]

Hi Luiz,

I love your patch! Perhaps something to improve:

[auto build test WARNING on bluetooth-next/master]
[also build test WARNING on bluetooth/master linus/master v5.19 next-20220728]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Luiz-Augusto-von-Dentz/Bluetooth-L2CAP-Fix-l2cap_global_chan_by_psm-regression/20220802-050647
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth-next.git master
config: parisc-randconfig-r024-20220801 (https://download.01.org/0day-ci/archive/20220802/202208020648.fs6gb987-lkp@intel.com/config)
compiler: hppa-linux-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://github.com/intel-lab-lkp/linux/commit/075988314335917c0e43d00f6a3a8ef68963b3de
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Luiz-Augusto-von-Dentz/Bluetooth-L2CAP-Fix-l2cap_global_chan_by_psm-regression/20220802-050647
        git checkout 075988314335917c0e43d00f6a3a8ef68963b3de
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=parisc SHELL=/bin/bash net/bluetooth/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

   In file included from net/bluetooth/l2cap_core.c:37:
   In function 'bacmp',
       inlined from 'l2cap_global_chan_by_psm' at net/bluetooth/l2cap_core.c:2003:15:
>> include/net/bluetooth/bluetooth.h:347:16: warning: 'memcmp' specified bound 6 exceeds source size 0 [-Wstringop-overread]
     347 |         return memcmp(ba1, ba2, sizeof(bdaddr_t));
         |                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/memcmp +347 include/net/bluetooth/bluetooth.h

^1da177e4c3f41 Linus Torvalds 2005-04-16  343  
^1da177e4c3f41 Linus Torvalds 2005-04-16  344  /* Copy, swap, convert BD Address */
f53c20e93612f7 David Herrmann 2013-04-06  345  static inline int bacmp(const bdaddr_t *ba1, const bdaddr_t *ba2)
^1da177e4c3f41 Linus Torvalds 2005-04-16  346  {
^1da177e4c3f41 Linus Torvalds 2005-04-16 @347  	return memcmp(ba1, ba2, sizeof(bdaddr_t));
^1da177e4c3f41 Linus Torvalds 2005-04-16  348  }
f53c20e93612f7 David Herrmann 2013-04-06  349  static inline void bacpy(bdaddr_t *dst, const bdaddr_t *src)
^1da177e4c3f41 Linus Torvalds 2005-04-16  350  {
^1da177e4c3f41 Linus Torvalds 2005-04-16  351  	memcpy(dst, src, sizeof(bdaddr_t));
^1da177e4c3f41 Linus Torvalds 2005-04-16  352  }
^1da177e4c3f41 Linus Torvalds 2005-04-16  353  

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