Re: [PATCH] fix slab-out-of-bounds Write in betop_probe

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

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Hi "F.A.Sulaiman",

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on hid/for-next]
[also build test WARNING on v5.14-rc6 next-20210816]
[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]

url:    https://github.com/0day-ci/linux/commits/F-A-Sulaiman/fix-slab-out-of-bounds-Write-in-betop_probe/20210817-041818
base:   https://git.kernel.org/pub/scm/linux/kernel/git/hid/hid.git for-next
config: i386-allyesconfig (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://github.com/0day-ci/linux/commit/8fc4d7961e182bc2992bee548fa3c33b628ffadd
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review F-A-Sulaiman/fix-slab-out-of-bounds-Write-in-betop_probe/20210817-041818
        git checkout 8fc4d7961e182bc2992bee548fa3c33b628ffadd
        # save the attached .config to linux build tree
        make W=1 ARCH=i386 

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

All warnings (new ones prefixed by >>):

   drivers/hid/hid-betopff.c: In function 'betop_probe':
>> drivers/hid/hid-betopff.c:118:20: warning: variable 'dev' set but not used [-Wunused-but-set-variable]
     118 |  struct input_dev *dev;
         |                    ^~~


vim +/dev +118 drivers/hid/hid-betopff.c

   114	
   115	static int betop_probe(struct hid_device *hdev, const struct hid_device_id *id)
   116	{
   117		struct hid_input *hidinput;
 > 118		struct input_dev *dev;
   119		int ret;
   120	
   121		if (list_empty(&hdev->inputs)) {
   122			hid_err(hdev, "no inputs found\n");
   123			return -ENODEV;
   124		}
   125	
   126		hidinput = list_first_entry(&hdev->inputs, struct hid_input, list);
   127		dev = hidinput->input;
   128	
   129		if (id->driver_data)
   130			hdev->quirks |= HID_QUIRK_MULTI_INPUT;
   131	
   132		ret = hid_parse(hdev);
   133		if (ret) {
   134			hid_err(hdev, "parse failed\n");
   135			goto err;
   136		}
   137	
   138		ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
   139		if (ret) {
   140			hid_err(hdev, "hw start failed\n");
   141			goto err;
   142		}
   143	
   144		betopff_init(hdev);
   145	
   146		return 0;
   147	err:
   148		return ret;
   149	}
   150	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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