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Date:   Sat, 16 Sep 2023 10:04:43 +0800
From:   kernel test robot <lkp@intel.com>
To:     Luiz Augusto von Dentz <luiz.dentz@gmail.com>,
        linux-bluetooth@vger.kernel.org
Cc:     oe-kbuild-all@lists.linux.dev
Subject: Re: [PATCH v3 1/2] Bluetooth: hci_core: Fix build warnings
Message-ID: <202309160927.DmionDGV-lkp@intel.com>
References: <20230915234742.3739283-1-luiz.dentz@gmail.com>
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In-Reply-To: <20230915234742.3739283-1-luiz.dentz@gmail.com>
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Hi Luiz,

kernel test robot noticed the following build warnings:

[auto build test WARNING on linus/master]
[also build test WARNING on v6.6-rc1 next-20230915]
[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-hci_codec-Fix-leaking-content-of-local_codecs/20230916-075018
base:   linus/master
patch link:    https://lore.kernel.org/r/20230915234742.3739283-1-luiz.dentz%40gmail.com
patch subject: [PATCH v3 1/2] Bluetooth: hci_core: Fix build warnings
config: parisc-randconfig-002-20230916 (https://download.01.org/0day-ci/archive/20230916/202309160927.DmionDGV-lkp@intel.com/config)
compiler: hppa-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20230916/202309160927.DmionDGV-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202309160927.DmionDGV-lkp@intel.com/

All warnings (new ones prefixed by >>):

   net/bluetooth/hci_event.c: In function 'hci_cc_read_class_of_dev':
>> net/bluetooth/hci_event.c:521:9: warning: 'memcpy' writing 3 bytes into a region of size 0 overflows the destination [-Wstringop-overflow=]
     521 |         memcpy(hdev->dev_class, rp->dev_class, 3);
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   cc1: note: destination object is likely at address zero


vim +/memcpy +521 net/bluetooth/hci_event.c

e5b0ad69c97a04f Abhishek Pandit-Subedi 2021-03-03  510  
c8992cffbe7411c Luiz Augusto von Dentz 2021-12-01  511  static u8 hci_cc_read_class_of_dev(struct hci_dev *hdev, void *data,
c8992cffbe7411c Luiz Augusto von Dentz 2021-12-01  512  				   struct sk_buff *skb)
a9de9248064bfc8 Marcel Holtmann        2007-10-20  513  {
c8992cffbe7411c Luiz Augusto von Dentz 2021-12-01  514  	struct hci_rp_read_class_of_dev *rp = data;
e3f3a1aea8719ac Luiz Augusto von Dentz 2021-12-01  515  
e3f3a1aea8719ac Luiz Augusto von Dentz 2021-12-01  516  	bt_dev_dbg(hdev, "status 0x%2.2x", rp->status);
a9de9248064bfc8 Marcel Holtmann        2007-10-20  517  
a9de9248064bfc8 Marcel Holtmann        2007-10-20  518  	if (rp->status)
c8992cffbe7411c Luiz Augusto von Dentz 2021-12-01  519  		return rp->status;
a9de9248064bfc8 Marcel Holtmann        2007-10-20  520  
a9de9248064bfc8 Marcel Holtmann        2007-10-20 @521  	memcpy(hdev->dev_class, rp->dev_class, 3);
a9de9248064bfc8 Marcel Holtmann        2007-10-20  522  
e3f3a1aea8719ac Luiz Augusto von Dentz 2021-12-01  523  	bt_dev_dbg(hdev, "class 0x%.2x%.2x%.2x", hdev->dev_class[2],
e3f3a1aea8719ac Luiz Augusto von Dentz 2021-12-01  524  		   hdev->dev_class[1], hdev->dev_class[0]);
c8992cffbe7411c Luiz Augusto von Dentz 2021-12-01  525  
c8992cffbe7411c Luiz Augusto von Dentz 2021-12-01  526  	return rp->status;
a9de9248064bfc8 Marcel Holtmann        2007-10-20  527  }
a9de9248064bfc8 Marcel Holtmann        2007-10-20  528  

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki