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mm/util: Swap kmemdup_array() arguments

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GCC 14.1 complains about the argument usage of kmemdup_array():

  drivers/soc/tegra/fuse/fuse-tegra.c:130:65: error: 'kmemdup_array' sizes specified with 'sizeof' in the earlier argument and not in the later argument [-Werror=calloc-transposed-args]
    130 |         fuse->lookups = kmemdup_array(fuse->soc->lookups, sizeof(*fuse->lookups),
        |                                                                 ^
  drivers/soc/tegra/fuse/fuse-tegra.c:130:65: note: earlier argument should specify number of elements, later size of each element

The annotation introduced by commit 7d78a77733 ("string: Add
additional __realloc_size() annotations for "dup" helpers") lets the
compiler think that kmemdup_array() follows the same format as calloc(),
with the number of elements preceding the size of one element. So we
could simply swap the arguments to __realloc_size() to get rid of that
warning, but it seems cleaner to instead have kmemdup_array() follow the
same format as krealloc_array(), memdup_array_user(), calloc() etc.

Fixes: 7d78a77733 ("string: Add additional __realloc_size() annotations for "dup" helpers")
Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20240606144608.97817-2-jean-philippe@linaro.org
Signed-off-by: Kees Cook <kees@kernel.org>
This commit is contained in:
Jean-Philippe Brucker 2024-06-06 15:46:09 +01:00 committed by Kees Cook
parent c3f38fa61a
commit 0ee1472547
4 changed files with 6 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/soc/tegra/fuse/fuse-tegra.c
View File

@ -127,8 +127,8 @@ static void tegra_fuse_print_sku_info(struct tegra_sku_info *tegra_sku_info)
static int tegra_fuse_add_lookups(struct tegra_fuse *fuse)
{
fuse->lookups = kmemdup_array(fuse->soc->lookups, sizeof(*fuse->lookups),
fuse->soc->num_lookups, GFP_KERNEL);
fuse->lookups = kmemdup_array(fuse->soc->lookups, fuse->soc->num_lookups,
sizeof(*fuse->lookups), GFP_KERNEL);
if (!fuse->lookups)
return -ENOMEM;

2
include/linux/string.h
View File

@ -289,7 +289,7 @@ extern void *kmemdup_noprof(const void *src, size_t len, gfp_t gfp) __realloc_si
extern void *kvmemdup(const void *src, size_t len, gfp_t gfp) __realloc_size(2);
extern char *kmemdup_nul(const char *s, size_t len, gfp_t gfp);
extern void *kmemdup_array(const void *src, size_t element_size, size_t count, gfp_t gfp)
extern void *kmemdup_array(const void *src, size_t count, size_t element_size, gfp_t gfp)
__realloc_size(2, 3);
/* lib/argv_split.c */

2
lib/fortify_kunit.c
View File

@ -374,7 +374,7 @@ static const char * const test_strs[] = {
for (i = 0; i < ARRAY_SIZE(test_strs); i++) { \
len = strlen(test_strs[i]); \
KUNIT_EXPECT_EQ(test, __builtin_constant_p(len), 0); \
checker(len, kmemdup_array(test_strs[i], len, 1, gfp), \
checker(len, kmemdup_array(test_strs[i], 1, len, gfp), \
kfree(p)); \
checker(len, kmemdup(test_strs[i], len, gfp), \
kfree(p)); \

4
mm/util.c
View File

@ -139,14 +139,14 @@ EXPORT_SYMBOL(kmemdup_noprof);
* kmemdup_array - duplicate a given array.
*
* @src: array to duplicate.
* @element_size: size of each element of array.
* @count: number of elements to duplicate from array.
* @element_size: size of each element of array.
* @gfp: GFP mask to use.
*
* Return: duplicated array of @src or %NULL in case of error,
* result is physically contiguous. Use kfree() to free.
*/
void *kmemdup_array(const void *src, size_t element_size, size_t count, gfp_t gfp)
void *kmemdup_array(const void *src, size_t count, size_t element_size, gfp_t gfp)
{
return kmemdup(src, size_mul(element_size, count), gfp);
}