[PATCH] sctp: annotate struct sctp_assoc_ids with __counted_by()

[Erick Archer]

Prepare for the coming implementation by GCC and Clang of the
__counted_by attribute. Flexible array members annotated with
__counted_by can have their accesses bounds-checked at run-time via
CONFIG_UBSAN_BOUNDS (for array indexing) and CONFIG_FORTIFY_SOURCE
(for strcpy/memcpy-family functions).

Suggested-by: Kees Cook <keescook@xxxxxxxxxxxx>
Signed-off-by: Erick Archer <erick.archer@xxxxxxxxxxx>
---
 include/uapi/linux/sctp.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/uapi/linux/sctp.h b/include/uapi/linux/sctp.h
index b7d91d4cf0db..836173e73401 100644
--- a/include/uapi/linux/sctp.h
+++ b/include/uapi/linux/sctp.h
@@ -1007,7 +1007,7 @@ enum sctp_sstat_state {
  */
 struct sctp_assoc_ids {
 	__u32		gaids_number_of_ids;
-	sctp_assoc_t	gaids_assoc_id[];
+	sctp_assoc_t	gaids_assoc_id[] __counted_by(gaids_number_of_ids);
 };
 
 /*
-- 
2.25.1