netdev - Re: [PATCH] [net-next] net/mlx5e: avoid uninitialized variable use

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Date:   Wed, 10 Jul 2019 14:22:32 +0000
From:   Tariq Toukan <tariqt@...lanox.com>
To:     Arnd Bergmann <arnd@...db.de>,
        Saeed Mahameed <saeedm@...lanox.com>,
        Leon Romanovsky <leon@...nel.org>,
        "David S. Miller" <davem@...emloft.net>
CC:     Tariq Toukan <tariqt@...lanox.com>,
        Eran Ben Elisha <eranbe@...lanox.com>,
        Boris Pismenny <borisp@...lanox.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "clang-built-linux@...glegroups.com" 
        <clang-built-linux@...glegroups.com>
Subject: Re: [PATCH] [net-next] net/mlx5e: avoid uninitialized variable use



On 7/10/2019 4:06 PM, Arnd Bergmann wrote:
> clang points to a variable being used in an unexpected
> code path:
> 
> drivers/net/ethernet/mellanox/mlx5/core/en_accel/ktls_tx.c:251:2: warning: variable 'rec_seq_sz' is used uninitialized whenever switch default is taken [-Wsometimes-uninitialized]
>          default:
>          ^~~~~~~
> drivers/net/ethernet/mellanox/mlx5/core/en_accel/ktls_tx.c:255:46: note: uninitialized use occurs here
>          skip_static_post = !memcmp(rec_seq, &rn_be, rec_seq_sz);
>                                                      ^~~~~~~~~~
> 
>  From looking at the function logic, it seems that there is no
> sensible way to continue here, so just return early and hope
> for the best.
> 
> Fixes: d2ead1f360e8 ("net/mlx5e: Add kTLS TX HW offload support")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>   drivers/net/ethernet/mellanox/mlx5/core/en_accel/ktls_tx.c | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ktls_tx.c b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ktls_tx.c
> index 3f5f4317a22b..5c08891806f0 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ktls_tx.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ktls_tx.c
> @@ -250,6 +250,7 @@ tx_post_resync_params(struct mlx5e_txqsq *sq,
>   	}
>   	default:
>   		WARN_ON(1);
> +		return;
>   	}
>   
>   	skip_static_post = !memcmp(rec_seq, &rn_be, rec_seq_sz);
> 

Reviewed-by: Tariq Toukan <tariqt@...lanox.com>

Thanks!