[PATCH] nexthop: Annotate struct nh_group with __counted_by

[Kees Cook <keescook@chromium.org>]

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 <dsahern@kernel.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Paolo Abeni <pabeni@redhat.com>
Cc: netdev@vger.kernel.org
Link: https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci [1]
Signed-off-by: Kees Cook <keescook@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