[PATCH] usb: replace strcpy() with strscpy()

[kernel test robot]

Hi Aditya,

kernel test robot noticed the following build errors:

[auto build test ERROR on usb/usb-testing]
[also build test ERROR on usb/usb-next usb/usb-linus johan-usb-serial/usb-next johan-usb-serial/usb-linus linus/master v6.14-rc4 next-20250228]
[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/Aditya-Garg/usb-replace-strcpy-with-strscpy/20250228-230839
base:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing
patch link:    https://lore.kernel.org/r/DEF7EF73-12C4-4F30-BC14-DD829F0C6884%40live.com
patch subject: [PATCH] usb: replace strcpy() with strscpy()
config: arm-qcom_defconfig (https://download.01.org/0day-ci/archive/20250302/202503020319.Lj7EYfWc-lkp@intel.com/config)
compiler: clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250302/202503020319.Lj7EYfWc-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 at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202503020319.Lj7EYfWc-lkp@intel.com/

All errors (new ones prefixed by >>):

>> drivers/usb/gadget/configfs.c:132:2: error: static assertion failed due to requirement '!(!(!__builtin_types_compatible_p(char *, char *)))': must be array
     132 |         strscpy(str, s);
         |         ^~~~~~~~~~~~~~~
   include/linux/string.h:114:2: note: expanded from macro 'strscpy'
     114 |         CONCATENATE(__strscpy, COUNT_ARGS(__VA_ARGS__))(dst, src, __VA_ARGS__)
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/args.h:26:27: note: expanded from macro 'CONCATENATE'
      26 | #define CONCATENATE(a, b) __CONCAT(a, b)
         |                           ^
   include/linux/args.h:25:24: note: expanded from macro '__CONCAT'
      25 | #define __CONCAT(a, b) a ## b
         |                        ^
   note: (skipping 1 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
   include/linux/string.h:80:40: note: expanded from macro '__strscpy0'
      80 |         sized_strscpy(dst, src, sizeof(dst) + __must_be_array(dst) +    \
         |                                               ^~~~~~~~~~~~~~~~~~~~
   include/linux/compiler.h:202:28: note: expanded from macro '__must_be_array'
     202 | #define __must_be_array(a)      __BUILD_BUG_ON_ZERO_MSG(!__is_array(a), \
         |                                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     203 |                                                         "must be array")
         |                                                         ~~~~~~~~~~~~~~~~
   include/linux/compiler.h:197:77: note: expanded from macro '__BUILD_BUG_ON_ZERO_MSG'
     197 | #define __BUILD_BUG_ON_ZERO_MSG(e, msg) ((int)sizeof(struct {_Static_assert(!(e), msg);}))
         |                                                                             ^~~~
   1 error generated.


vim +132 drivers/usb/gadget/configfs.c

   112	
   113	static int usb_string_copy(const char *s, char **s_copy)
   114	{
   115		int ret;
   116		char *str;
   117		char *copy = *s_copy;
   118	
   119		ret = strlen(s);
   120		if (ret > USB_MAX_STRING_LEN)
   121			return -EOVERFLOW;
   122		if (ret < 1)
   123			return -EINVAL;
   124	
   125		if (copy) {
   126			str = copy;
   127		} else {
   128			str = kmalloc(USB_MAX_STRING_WITH_NULL_LEN, GFP_KERNEL);
   129			if (!str)
   130				return -ENOMEM;
   131		}
 > 132		strscpy(str, s);
   133		if (str[ret - 1] == '\n')
   134			str[ret - 1] = '\0';
   135		*s_copy = str;
   136		return 0;
   137	}
   138	

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