Re: [PATCH 2/5] cxgb4: Annotate struct clip_tbl with __counted_by

["Gustavo A. R. Silva" <gustavo@embeddedor.com>]

On 9/29/23 20:11, 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 clip_tbl.
> 
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
> 
> Cc: Raju Rangoju <rajur@chelsio.com>
> 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
> Signed-off-by: Kees Cook <keescook@chromium.org>

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

Thanks
--
Gustavo

> ---
>   drivers/net/ethernet/chelsio/cxgb4/clip_tbl.h | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/chelsio/cxgb4/clip_tbl.h b/drivers/net/ethernet/chelsio/cxgb4/clip_tbl.h
> index 290c1058069a..847c7fc2bbd9 100644
> --- a/drivers/net/ethernet/chelsio/cxgb4/clip_tbl.h
> +++ b/drivers/net/ethernet/chelsio/cxgb4/clip_tbl.h
> @@ -29,7 +29,7 @@ struct clip_tbl {
>   	atomic_t nfree;
>   	struct list_head ce_free_head;
>   	void *cl_list;
> -	struct list_head hash_list[];
> +	struct list_head hash_list[] __counted_by(clipt_size);
>   };
>   
>   enum {