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).
As found with Coccinelle[1], add __counted_by for struct nh_group. Cc: David Ahern <dsah...@kernel.org> Cc: "David S. Miller" <da...@davemloft.net> Cc: Eric Dumazet <eduma...@google.com> Cc: Jakub Kicinski <k...@kernel.org> Cc: Paolo Abeni <pab...@redhat.com> Cc: net...@vger.kernel.org Link: https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci [1] Signed-off-by: Kees Cook <keesc...@chromium.org> --- include/net/nexthop.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/net/nexthop.h b/include/net/nexthop.h index 8f5a2ab45920..d92046a4a078 100644 --- a/include/net/nexthop.h +++ b/include/net/nexthop.h @@ -126,7 +126,7 @@ struct nh_group { bool has_v4; struct nh_res_table __rcu *res_table; - struct nh_grp_entry nh_entries[]; + struct nh_grp_entry nh_entries[] __counted_by(num_nh); }; struct nexthop { -- 2.34.1
