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SubjectRe: [PATCH 10/14] net: openvswitch: Annotate struct dp_meter_instance with __counted_by
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On 9/22/23 11:28, Kees Cook wrote:
> 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 dp_meter_instance.
>
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
>
> Cc: Pravin B Shelar <pshelar@ovn.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
> Cc: dev@openvswitch.org
> Signed-off-by: Kees Cook <keescook@chromium.org>

Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>

Thanks
--
Gustavo

> ---
> net/openvswitch/meter.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/net/openvswitch/meter.h b/net/openvswitch/meter.h
> index 0c33889a8515..013de694221f 100644
> --- a/net/openvswitch/meter.h
> +++ b/net/openvswitch/meter.h
> @@ -45,7 +45,7 @@ struct dp_meter {
> struct dp_meter_instance {
> struct rcu_head rcu;
> u32 n_meters;
> - struct dp_meter __rcu *dp_meters[];
> + struct dp_meter __rcu *dp_meters[] __counted_by(n_meters);
> };
>
> struct dp_meter_table {

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