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| author | Kartik <kkartik@nvidia.com> | 2023-10-17 10:53:15 +0530 |
|---|---|---|
| committer | Thierry Reding <treding@nvidia.com> | 2024-02-01 15:58:05 +0100 |
| commit | 7092e9b3bed1252c7d3f5812b9fb9d82375b73a6 (patch) | |
| tree | f394199a150ef9400a8967586a481d87e4e14768 | |
| parent | 9863084dd9939e53eb67a689f13503e8025434ac (diff) | |
| download | linux-7092e9b3bed1252c7d3f5812b9fb9d82375b73a6.tar.gz linux-7092e9b3bed1252c7d3f5812b9fb9d82375b73a6.tar.bz2 linux-7092e9b3bed1252c7d3f5812b9fb9d82375b73a6.zip | |
mm/util: Introduce kmemdup_array()
Introduce kmemdup_array() API to duplicate `n` number of elements
from a given array. This internally uses kmemdup to allocate and duplicate
the `src` array.
Signed-off-by: Kartik <kkartik@nvidia.com>
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Thierry Reding <treding@nvidia.com>
| -rw-r--r-- | include/linux/string.h | 1 | ||||
| -rw-r--r-- | mm/util.c | 17 |
2 files changed, 18 insertions, 0 deletions
diff --git a/include/linux/string.h b/include/linux/string.h index ab148d8dbfc1..4795ee5c50c6 100644 --- a/include/linux/string.h +++ b/include/linux/string.h @@ -217,6 +217,7 @@ extern char *kstrndup(const char *s, size_t len, gfp_t gfp); extern void *kmemdup(const void *src, size_t len, gfp_t gfp) __realloc_size(2); 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 char **argv_split(gfp_t gfp, const char *str, int *argcp); extern void argv_free(char **argv); diff --git a/mm/util.c b/mm/util.c index 5a6a9802583b..5faf3adc6f43 100644 --- a/mm/util.c +++ b/mm/util.c @@ -136,6 +136,23 @@ void *kmemdup(const void *src, size_t len, gfp_t gfp) EXPORT_SYMBOL(kmemdup); /** + * 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. + * @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) +{ + return kmemdup(src, size_mul(element_size, count), gfp); +} +EXPORT_SYMBOL(kmemdup_array); + +/** * kvmemdup - duplicate region of memory * * @src: memory region to duplicate |