[ammarfaizi2-block:google/android/kernel/common/android-4.14-stable 2063/9999] fs/incfs/integrity.c:196:9: sparse: sparse: Variable length array is used.

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

tree:   https://github.com/ammarfaizi2/linux-block google/android/kernel/common/android-4.14-stable
head:   c529afa15a69594211793a68cb70c873508061df
commit: 318babce66a62d8bc8d5434909a044b89ab3a53e [2063/9999] ANDROID: Initial commit of Incremental FS
config: i386-randconfig-s002 (https://download.01.org/0day-ci/archive/20220804/202208040848.d0TXD4pv-lkp@intel.com/config)
compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.4-39-gce1a6720-dirty
        # https://github.com/ammarfaizi2/linux-block/commit/318babce66a62d8bc8d5434909a044b89ab3a53e
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block google/android/kernel/common/android-4.14-stable
        git checkout 318babce66a62d8bc8d5434909a044b89ab3a53e
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=i386 SHELL=/bin/bash drivers/md/ fs/incfs/

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

sparse warnings: (new ones prefixed by >>)
>> fs/incfs/integrity.c:196:9: sparse: sparse: Variable length array is used.
   In file included from include/linux/kernel.h:14:0,
                    from include/linux/crypto.h:21,
                    from include/crypto/hash.h:16,
                    from fs/incfs/integrity.c:6:
   fs/incfs/integrity.c: In function 'incfs_validate_pkcs7_signature':
   include/linux/kern_levels.h:5:18: warning: format '%ld' expects argument of type 'long int', but argument 3 has type 'size_t {aka unsigned int}' [-Wformat=]
    #define KERN_SOH "001"  /* ASCII Start Of Header */
                     ^
   include/linux/printk.h:137:11: note: in definition of macro 'no_printk'
       printk(fmt, ##__VA_ARGS__); 12-           ^~~
   include/linux/kern_levels.h:15:20: note: in expansion of macro 'KERN_SOH'
    #define KERN_DEBUG KERN_SOH "7" /* debug-level messages */
                       ^~~~~~~~
   include/linux/printk.h:344:12: note: in expansion of macro 'KERN_DEBUG'
     no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
               ^~~~~~~~~~
   fs/incfs/integrity.c:24:3: note: in expansion of macro 'pr_debug'
      pr_debug("PKCS#7 parsing error. ptr=%p size=%ld err=%ldn",
      ^~~~~~~~
   fs/incfs/integrity.c:24:49: note: format string is defined here
      pr_debug("PKCS#7 parsing error. ptr=%p size=%ld err=%ldn",
                                                  ~~^
                                                  %d

vim +196 fs/incfs/integrity.c

   192	
   193	int incfs_calc_digest(struct incfs_hash_alg *alg, struct mem_range data,
   194				struct mem_range digest)
   195	{
 > 196		SHASH_DESC_ON_STACK(desc, alg->shash);
   197	
   198		if (!alg || !alg->shash || !data.data || !digest.data)
   199			return -EFAULT;
   200	
   201		if (alg->digest_size > digest.len)
   202			return -EINVAL;
   203	
   204		desc->tfm = alg->shash;
   205		return crypto_shash_digest(desc, data.data, data.len, digest.data);
   206	}
   207	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp