Re: [PATCH 2/2] memblock: annotate struct memblock_type with __counted_by_ptr

[Mike Rapoport <rppt@kernel.org>]

On Fri, Nov 21, 2025 at 07:39:44PM +0000, Bill Wendling wrote:
> Add the '__counted_by_ptr' attribute to the 'regions' field of 'struct
> memblock_type'. The 'regions' field is an array of 'struct
> memblock_region' and its size is tracked by the 'max' field, which
> represents the total number of allocated regions.
> 
> This annotation allows the Kernel Address Sanitizer (KASAN) to detect
> out-of-bounds accesses to the 'regions' array.
> 
> Signed-off-by: Bill Wendling <morbo@google.com>
> ---
>  include/linux/memblock.h | 2 +-

Please also update tools/testing/memblock

>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/include/linux/memblock.h b/include/linux/memblock.h
> index 221118b5a16e..ba7f7c999a45 100644
> --- a/include/linux/memblock.h
> +++ b/include/linux/memblock.h
> @@ -91,7 +91,7 @@ struct memblock_type {
>  	unsigned long cnt;
>  	unsigned long max;
>  	phys_addr_t total_size;
> -	struct memblock_region *regions;
> +	struct memblock_region *regions __counted_by_ptr(max);
>  	char *name;
>  };
>  
> -- 
> 2.52.0.rc2.455.g230fcf2819-goog
> 

-- 
Sincerely yours,
Mike.