mlxsw: spectrum_router: Annotate struct mlxsw_sp_nexthop_group_info 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 checking 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 mlxsw_sp_nexthop_group_info.

[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci

Cc: Petr Machata <petrm@nvidia.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Link: https://lore.kernel.org/r/20230929180746.3005922-4-keescook@chromium.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
index debd2c466f11cbd60e355dee0190f6e4053aa585..82a95125d9cafdfde43baf9f7234bb04a37e5717 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
@@ -3107,7 +3107,7 @@ struct mlxsw_sp_nexthop_group_info {
           gateway:1, /* routes using the group use a gateway */
           is_resilient:1;
        struct list_head list; /* member in nh_res_grp_list */
-       struct mlxsw_sp_nexthop nexthops[];
+       struct mlxsw_sp_nexthop nexthops[] __counted_by(count);
 };
 
 static struct mlxsw_sp_rif *