[kees:for-next/hardening 6/14] mm/kasan/kasan_test_c.c:1504:7: warning: argument to variable-length array may be too large due to conversion from 'int' to 'long unsigned int'

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git for-next/hardening
head:   48b79238694db6e7eb3dd6153cf71107db624a11
commit: 1ca6c23046d30abfe57d8706248ad5888aafa3bf [6/14] kbuild: Switch from -Wvla to -Wvla-larger-than=1
:::::: branch date: 33 hours ago
:::::: commit date: 9 days ago
config: arm64-randconfig-002-20250502 (https://download.01.org/0day-ci/archive/20250507/202505071331.4iOzqmuE-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 8.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250507/202505071331.4iOzqmuE-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@intel.com>
| Closes: https://lore.kernel.org/r/202505071331.4iOzqmuE-lkp@intel.com/

All warnings (new ones prefixed by >>):

   mm/kasan/kasan_test_c.c: In function 'kasan_alloca_oob_right':
>> mm/kasan/kasan_test_c.c:1504:7: warning: argument to variable-length array may be too large due to conversion from 'int' to 'long unsigned int' [-Wvla-larger-than=]
     char alloca_array[i];
          ^~~~~~~~~~~~
   mm/kasan/kasan_test_c.c: In function 'kasan_alloca_oob_left':
   mm/kasan/kasan_test_c.c:1489:7: warning: argument to variable-length array may be too large due to conversion from 'int' to 'long unsigned int' [-Wvla-larger-than=]
     char alloca_array[i];
          ^~~~~~~~~~~~
   mm/kasan/kasan_test_c.c: At top level:
   cc1: warning: unrecognized command line option '-Wno-vla-larger-than'


vim +1504 mm/kasan/kasan_test_c.c

00a14294bb33af lib/test_kasan.c Paul Lawrence       2018-02-06  1500  
73228c7ecc5e40 lib/test_kasan.c Patricia Alfonso    2020-10-13  1501  static void kasan_alloca_oob_right(struct kunit *test)
00a14294bb33af lib/test_kasan.c Paul Lawrence       2018-02-06  1502  {
00a14294bb33af lib/test_kasan.c Paul Lawrence       2018-02-06  1503  	volatile int i = 10;
00a14294bb33af lib/test_kasan.c Paul Lawrence       2018-02-06 @1504  	char alloca_array[i];
2dfd1bd992322f lib/test_kasan.c Peter Collingbourne 2022-03-24  1505  	/* See comment in kasan_global_oob_right. */
f649dc0e0d7b50 lib/test_kasan.c Peter Collingbourne 2021-05-14  1506  	char *volatile array = alloca_array;
f649dc0e0d7b50 lib/test_kasan.c Peter Collingbourne 2021-05-14  1507  	char *p = array + i;
00a14294bb33af lib/test_kasan.c Paul Lawrence       2018-02-06  1508  
58b999d7a22c59 lib/test_kasan.c Andrey Konovalov    2020-11-01  1509  	/* Only generic mode instruments dynamic allocas. */
da17e377723f50 lib/test_kasan.c Andrey Konovalov    2021-02-24  1510  	KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_GENERIC);
da17e377723f50 lib/test_kasan.c Andrey Konovalov    2021-02-24  1511  	KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_STACK);
00a14294bb33af lib/test_kasan.c Paul Lawrence       2018-02-06  1512  
73228c7ecc5e40 lib/test_kasan.c Patricia Alfonso    2020-10-13  1513  	KUNIT_EXPECT_KASAN_FAIL(test, *(volatile char *)p);
73228c7ecc5e40 lib/test_kasan.c Patricia Alfonso    2020-10-13  1514  }
73228c7ecc5e40 lib/test_kasan.c Patricia Alfonso    2020-10-13  1515  

:::::: The code at line 1504 was first introduced by commit
:::::: 00a14294bb33af533f7ac002fb20623fdd8ea0d7 kasan: add tests for alloca poisoning

:::::: TO: Paul Lawrence <paullawrence@google.com>
:::::: CC: Linus Torvalds <torvalds@linux-foundation.org>

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