Re: [PATCH v2] HID: wacom: replace sprintf calls with safer alternatives
From: kernel test robot
Date: Tue Nov 03 2026 - 04:33:32 EST
Hi Nehuen,
kernel test robot noticed the following build errors:
[auto build test ERROR on hid/for-next]
[also build test ERROR on linus/master v7.3 next-20261030]
[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/Nehuen-Lian-Bova/HID-wacom-replace-sprintf-calls-with-safer-alternatives/20261101-024830
base: https://git.kernel.org/pub/scm/linux/kernel/git/hid/hid.git for-next
patch link: https://lore.kernel.org/r/20261101054830.291749-1-nehuenlian.kernel%40gmail.com
patch subject: [PATCH v2] HID: wacom: replace sprintf calls with safer alternatives
config: i386-randconfig-1000-20261103 (https://download.01.org/0day-ci/archive/20261103/202611031735.MAqF2fN1-lkp@xxxxxxxxx/config)
compiler: clang version 22.1.8 (https://github.com/llvm/llvm-project ca7933e47d3a3451d81e72ac174dcb5aa28b59d1)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20261103/202611031735.MAqF2fN1-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202611031735.MAqF2fN1-lkp@xxxxxxxxx/
All errors (new ones prefixed by >>):
>> drivers/hid/wacom_sys.c:1842:30: error: incompatible pointer to integer conversion passing 'char[18]' to parameter of type '__size_t' (aka 'unsigned int') [-Wint-conversion]
1842 | snprintf(battery->bat_name, "wacom_battery_%ld", n);
| ^~~~~~~~~~~~~~~~~~~
include/linux/sprintf.h:13:47: note: passing argument to parameter 'size' here
13 | __printf(3, 4) int snprintf(char *buf, size_t size, const char *fmt, ...);
| ^
>> drivers/hid/wacom_sys.c:1842:51: error: incompatible integer to pointer conversion passing 'unsigned long' to parameter of type 'const char *' [-Wint-conversion]
1842 | snprintf(battery->bat_name, "wacom_battery_%ld", n);
| ^
include/linux/sprintf.h:13:65: note: passing argument to parameter 'fmt' here
13 | __printf(3, 4) int snprintf(char *buf, size_t size, const char *fmt, ...);
| ^
2 errors generated.
vim +1842 drivers/hid/wacom_sys.c
1820
1821 static int __wacom_initialize_battery(struct wacom *wacom,
1822 struct wacom_battery *battery)
1823 {
1824 static atomic_t battery_no = ATOMIC_INIT(0);
1825 struct device *dev = &wacom->hdev->dev;
1826 struct power_supply_config psy_cfg = { .drv_data = battery, };
1827 struct power_supply *ps_bat;
1828 struct power_supply_desc *bat_desc = &battery->bat_desc;
1829 unsigned long n;
1830 int error;
1831
1832 if (!devres_open_group(dev, bat_desc, GFP_KERNEL))
1833 return -ENOMEM;
1834
1835 battery->wacom = wacom;
1836
1837 n = atomic_inc_return(&battery_no) - 1;
1838
1839 bat_desc->properties = wacom_battery_props;
1840 bat_desc->num_properties = ARRAY_SIZE(wacom_battery_props);
1841 bat_desc->get_property = wacom_battery_get_property;
> 1842 snprintf(battery->bat_name, "wacom_battery_%ld", n);
1843 bat_desc->name = battery->bat_name;
1844 bat_desc->type = POWER_SUPPLY_TYPE_BATTERY;
1845 bat_desc->use_for_apm = 0;
1846
1847 ps_bat = devm_power_supply_register(dev, bat_desc, &psy_cfg);
1848 if (IS_ERR(ps_bat)) {
1849 error = PTR_ERR(ps_bat);
1850 goto err;
1851 }
1852
1853 power_supply_powers(ps_bat, &wacom->hdev->dev);
1854
1855 battery->battery = ps_bat;
1856
1857 devres_close_group(dev, bat_desc);
1858 return 0;
1859
1860 err:
1861 devres_release_group(dev, bat_desc);
1862 return error;
1863 }
1864
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