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Date: Tue,  3 Oct 2023 18:44:49 -0700
From: Kees Cook <>
To: David Ahern <>
Cc: Kees Cook <>,
	"David S. Miller" <>,
	Eric Dumazet <>,
	Jakub Kicinski <>,
	Paolo Abeni <>,,
	"Gustavo A. R. Silva" <>,
	Nathan Chancellor <>,
	Nick Desaulniers <>,
	Tom Rix <>,,,
Subject: [PATCH] nexthop: Annotate struct nh_group with __counted_by

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

As found with Coccinelle[1], add __counted_by for struct nh_group.

Cc: David Ahern <>
Cc: "David S. Miller" <>
Cc: Eric Dumazet <>
Cc: Jakub Kicinski <>
Cc: Paolo Abeni <>
Link: [1]
Signed-off-by: Kees Cook <>
 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 {

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