[linux-next:pending-fixes 13358/13464] include/net/bluetooth/bluetooth.h:347:16: warning: 'memcmp' specified bound 6 exceeds source size 0

[linux-next:pending-fixes 13358/13464] include/net/bluetooth/bluetooth.h:347:16: warning: 'memcmp' specified bound 6 exceeds source size 0

[kernel test robot]

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:::::: 
:::::: Manual check reason: "low confidence static check first_new_problem: include/net/bluetooth/bluetooth.h:347:16: warning: 'memcmp' specified bound 6 exceeds source size 0 [-Wstringop-overread]"
:::::: 

BCC: lkp(a)intel.com
CC: kbuild-all(a)lists.01.org
CC: Linux Memory Management List <linux-mm@kvack.org>
TO: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git pending-fixes
head:   5c5775c41d5494a213623a99b8ba1a7679efd79f
commit: 332f1795ca202489c665a75e62e18ff6284de077 [13358/13464] Bluetooth: L2CAP: Fix l2cap_global_chan_by_psm regression
:::::: branch date: 9 hours ago
:::::: commit date: 32 hours ago
config: powerpc-randconfig-s051-20220810 (https://download.01.org/0day-ci/archive/20220810/202208101504.NDdUBuGe-lkp(a)intel.com/config)
compiler: powerpc-linux-gcc (GCC) 12.1.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.4-39-gce1a6720-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=332f1795ca202489c665a75e62e18ff6284de077
        git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
        git fetch --no-tags linux-next pending-fixes
        git checkout 332f1795ca202489c665a75e62e18ff6284de077
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=powerpc 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));
         |                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   In function 'bacmp',
       inlined from 'l2cap_global_chan_by_psm' at net/bluetooth/l2cap_core.c:2004:15:
>> 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  

:::::: The code at line 347 was first introduced by commit
:::::: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Linux-2.6.12-rc2

:::::: TO: Linus Torvalds <torvalds@ppc970.osdl.org>
:::::: CC: Linus Torvalds <torvalds@ppc970.osdl.org>

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