On 16/04/25 11:29, Kees Cook wrote:
Mention the use of __member_size() for DEFINE_FLEX variables as a hint for getting at the compile-time size of the resulting flexible array member. Signed-off-by: Kees Cook <[email protected]>
Reviewed-by: Gustavo A. R. Silva <[email protected]> Thanks! -- Gustavo
--- Cc: "Gustavo A. R. Silva" <[email protected]> Cc: [email protected] --- include/linux/overflow.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/include/linux/overflow.h b/include/linux/overflow.h index 0c7e3dcfe867..6ee67c20b575 100644 --- a/include/linux/overflow.h +++ b/include/linux/overflow.h @@ -419,6 +419,7 @@ static inline size_t __must_check size_sub(size_t minuend, size_t subtrahend) * Define a zeroed, on-stack, instance of @type structure with a trailing * flexible array member. * Use __struct_size(@name) to get compile-time size of it afterwards. + * Use __member_size(@name->member) to get compile-time size of @name members. */ #define DEFINE_RAW_FLEX(type, name, member, count) \ _DEFINE_FLEX(type, name, member, count, = {}) @@ -436,6 +437,7 @@ static inline size_t __must_check size_sub(size_t minuend, size_t subtrahend) * Define a zeroed, on-stack, instance of @TYPE structure with a trailing * flexible array member. * Use __struct_size(@NAME) to get compile-time size of it afterwards. + * Use __member_size(@NAME->member) to get compile-time size of @NAME members. */ #define DEFINE_FLEX(TYPE, NAME, MEMBER, COUNTER, COUNT) \ _DEFINE_FLEX(TYPE, NAME, MEMBER, COUNT, = { .obj.COUNTER = COUNT, })
