On 10/27/20 1:17 PM, Bartosz Golaszewski wrote:
From: Bartosz Golaszewski bgolaszewski@baylibre.com
When allocating an array of elements, users should check for multiplication overflow or preferably use one of the provided helpers like: kmalloc_array().
There's no krealloc_array() counterpart but there are many users who use regular krealloc() to reallocate arrays. Let's provide an actual krealloc_array() implementation.
Signed-off-by: Bartosz Golaszewski bgolaszewski@baylibre.com
Makes sense. Acked-by: Vlastimil Babka vbabka@suse.cz
include/linux/slab.h | 11 +++++++++++ 1 file changed, 11 insertions(+)
diff --git a/include/linux/slab.h b/include/linux/slab.h index dd6897f62010..0e6683affee7 100644 --- a/include/linux/slab.h +++ b/include/linux/slab.h @@ -592,6 +592,17 @@ static inline void *kmalloc_array(size_t n, size_t size, gfp_t flags) return __kmalloc(bytes, flags); }
+static __must_check inline void * +krealloc_array(void *p, size_t new_n, size_t new_size, gfp_t flags) +{
- size_t bytes;
- if (unlikely(check_mul_overflow(new_n, new_size, &bytes)))
return NULL;- return krealloc(p, bytes, flags);
+}
- /**
- kcalloc - allocate memory for an array. The memory is set to zero.
- @n: number of elements.