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SubjectRe: [PATCH 5/5] cxgb4: Annotate struct smt_data with __counted_by
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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 smt_data.
>
> [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/smt.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/chelsio/cxgb4/smt.h b/drivers/net/ethernet/chelsio/cxgb4/smt.h
> index 541249d78914..109c1dff563a 100644
> --- a/drivers/net/ethernet/chelsio/cxgb4/smt.h
> +++ b/drivers/net/ethernet/chelsio/cxgb4/smt.h
> @@ -66,7 +66,7 @@ struct smt_entry {
> struct smt_data {
> unsigned int smt_size;
> rwlock_t lock;
> - struct smt_entry smtab[];
> + struct smt_entry smtab[] __counted_by(smt_size);
> };
>
> struct smt_data *t4_init_smt(void);

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