linux-kernel - drivers/leds/trigger/ledtrig-netdev.c:120:34: warning: array subscript 17 is above array bounds of 'char[16]'

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Message-ID: <202309192035.GTJEEbem-lkp@intel.com>
Date:   Tue, 19 Sep 2023 20:21:03 +0800
From:   kernel test robot <lkp@...el.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Christian Marangi <ansuelsmth@...il.com>
Subject: drivers/leds/trigger/ledtrig-netdev.c:120:34: warning: array
 subscript 17 is above array bounds of 'char[16]'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   2cf0f715623872823a72e451243bbf555d10d032
commit: 28a6a2ef18ad840a390d519840c303b03040961c leds: trigger: netdev: refactor code setting device name
date:   4 months ago
config: loongarch-allmodconfig (https://download.01.org/0day-ci/archive/20230919/202309192035.GTJEEbem-lkp@intel.com/config)
compiler: loongarch64-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20230919/202309192035.GTJEEbem-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@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202309192035.GTJEEbem-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/leds/trigger/ledtrig-netdev.c: In function 'set_device_name':
>> drivers/leds/trigger/ledtrig-netdev.c:120:34: warning: array subscript 17 is above array bounds of 'char[16]' [-Warray-bounds=]
     120 |         trigger_data->device_name[size] = 0;
         |         ~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~
   drivers/leds/trigger/ledtrig-netdev.c:48:14: note: while referencing 'device_name'
      48 |         char device_name[IFNAMSIZ];
         |              ^~~~~~~~~~~
>> drivers/leds/trigger/ledtrig-netdev.c:120:34: warning: array subscript 17 is above array bounds of 'char[16]' [-Warray-bounds=]
     120 |         trigger_data->device_name[size] = 0;
         |         ~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~
   drivers/leds/trigger/ledtrig-netdev.c:48:14: note: while referencing 'device_name'
      48 |         char device_name[IFNAMSIZ];
         |              ^~~~~~~~~~~


vim +120 drivers/leds/trigger/ledtrig-netdev.c

06f502f57d0d77 Ben Whitten       2017-12-10  106  
28a6a2ef18ad84 Andrew Lunn       2023-05-29  107  static int set_device_name(struct led_netdev_data *trigger_data,
28a6a2ef18ad84 Andrew Lunn       2023-05-29  108  			   const char *name, size_t size)
06f502f57d0d77 Ben Whitten       2017-12-10  109  {
06f502f57d0d77 Ben Whitten       2017-12-10  110  	cancel_delayed_work_sync(&trigger_data->work);
06f502f57d0d77 Ben Whitten       2017-12-10  111  
d1b9e1391ab2dc Christian Marangi 2023-04-19  112  	mutex_lock(&trigger_data->lock);
06f502f57d0d77 Ben Whitten       2017-12-10  113  
06f502f57d0d77 Ben Whitten       2017-12-10  114  	if (trigger_data->net_dev) {
06f502f57d0d77 Ben Whitten       2017-12-10  115  		dev_put(trigger_data->net_dev);
06f502f57d0d77 Ben Whitten       2017-12-10  116  		trigger_data->net_dev = NULL;
06f502f57d0d77 Ben Whitten       2017-12-10  117  	}
06f502f57d0d77 Ben Whitten       2017-12-10  118  
28a6a2ef18ad84 Andrew Lunn       2023-05-29  119  	memcpy(trigger_data->device_name, name, size);
909346433064b8 Rasmus Villemoes  2019-03-14 @120  	trigger_data->device_name[size] = 0;
06f502f57d0d77 Ben Whitten       2017-12-10  121  	if (size > 0 && trigger_data->device_name[size - 1] == '\n')
06f502f57d0d77 Ben Whitten       2017-12-10  122  		trigger_data->device_name[size - 1] = 0;
06f502f57d0d77 Ben Whitten       2017-12-10  123  
06f502f57d0d77 Ben Whitten       2017-12-10  124  	if (trigger_data->device_name[0] != 0)
06f502f57d0d77 Ben Whitten       2017-12-10  125  		trigger_data->net_dev =
06f502f57d0d77 Ben Whitten       2017-12-10  126  		    dev_get_by_name(&init_net, trigger_data->device_name);
06f502f57d0d77 Ben Whitten       2017-12-10  127  
e2f24cb1b5daf9 Christian Marangi 2023-04-19  128  	trigger_data->carrier_link_up = false;
06f502f57d0d77 Ben Whitten       2017-12-10  129  	if (trigger_data->net_dev != NULL)
e2f24cb1b5daf9 Christian Marangi 2023-04-19  130  		trigger_data->carrier_link_up = netif_carrier_ok(trigger_data->net_dev);
06f502f57d0d77 Ben Whitten       2017-12-10  131  
06f502f57d0d77 Ben Whitten       2017-12-10  132  	trigger_data->last_activity = 0;
06f502f57d0d77 Ben Whitten       2017-12-10  133  
06f502f57d0d77 Ben Whitten       2017-12-10  134  	set_baseline_state(trigger_data);
d1b9e1391ab2dc Christian Marangi 2023-04-19  135  	mutex_unlock(&trigger_data->lock);
06f502f57d0d77 Ben Whitten       2017-12-10  136  
28a6a2ef18ad84 Andrew Lunn       2023-05-29  137  	return 0;
28a6a2ef18ad84 Andrew Lunn       2023-05-29  138  }
28a6a2ef18ad84 Andrew Lunn       2023-05-29  139  

:::::: The code at line 120 was first introduced by commit
:::::: 909346433064b8d840dc82af26161926b8d37558 leds: trigger: netdev: use memcpy in device_name_store

:::::: TO: Rasmus Villemoes <linux@...musvillemoes.dk>
:::::: CC: Jacek Anaszewski <jacek.anaszewski@...il.com>

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