linux-kernel - Re: [PATCH][next] net/mlx5: Fix uininitialized pointer read on pointer attr

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Message-ID: <bc6d5d6ad5b3254d8e14997341995036f56e374d.camel@kernel.org>
Date:   Tue, 06 Oct 2020 16:20:57 -0700
From:   Saeed Mahameed <saeed@...nel.org>
To:     Colin King <colin.king@...onical.com>,
        Leon Romanovsky <leon@...nel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        "Gustavo A . R . Silva" <gustavoars@...nel.org>,
        netdev@...r.kernel.org, linux-rdma@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] net/mlx5: Fix uininitialized pointer read on
 pointer attr

On Tue, 2020-10-06 at 19:12 +0100, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> Currently the error exit path err_free kfree's attr. In the case
> where
> flow and parse_attr failed to be allocated this return path will free
> the uninitialized pointer attr, which is not correct.  In the other
> case where attr fails to allocate attr does not need to be freed. So
> in both error exits via err_free attr should not be freed, so remove
> it.
> 
> Addresses-Coverity: ("Uninitialized pointer read")
> Fixes: ff7ea04ad579 ("net/mlx5e: Fix potential null pointer
> dereference")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> ---
>  drivers/net/ethernet/mellanox/mlx5/core/en_tc.c | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
> b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
> index a0c356987e1a..e3a968e9e2a0 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
> @@ -4569,7 +4569,6 @@ mlx5e_alloc_flow(struct mlx5e_priv *priv, int
> attr_size,
>  err_free:
>  	kfree(flow);
>  	kvfree(parse_attr);
> -	kfree(attr);
>  	return err;
>  }
>  

Applied to net-next-mlx5,

Thanks.